diff --git a/GitX.xcodeproj/project.pbxproj b/GitX.xcodeproj/project.pbxproj
index 59cdb18..7be28b4 100644
--- a/GitX.xcodeproj/project.pbxproj
+++ b/GitX.xcodeproj/project.pbxproj
@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		3F0851D10EA52E4300C26EE5 /* md5.js in Resources */ = {isa = PBXBuildFile; fileRef = 3F0851CD0EA52D8E00C26EE5 /* md5.js */; };
 		770B37ED0679A11B001EADE2 /* GitTest_DataModel.xcdatamodel in Sources */ = {isa = PBXBuildFile; fileRef = 770B37EC0679A11B001EADE2 /* GitTest_DataModel.xcdatamodel */; };
 		77C8280E06725ACE000B614F /* ApplicationController.m in Sources */ = {isa = PBXBuildFile; fileRef = 77C8280C06725ACE000B614F /* ApplicationController.m */; };
 		8D11072B0486CEB800E47090 /* InfoPlist.strings in Resources */ = {isa = PBXBuildFile; fileRef = 089C165CFE840E0CC02AAC07 /* InfoPlist.strings */; };
@@ -60,6 +61,7 @@
 		F5C6F68D0E65FF9300478D97 /* PBGitLane.m in Sources */ = {isa = PBXBuildFile; fileRef = F5C6F68C0E65FF9300478D97 /* PBGitLane.m */; };
 		F5D2DC870EA401A80034AD24 /* PBGitConfig.m in Sources */ = {isa = PBXBuildFile; fileRef = F5D2DC860EA401A80034AD24 /* PBGitConfig.m */; };
 		F5DFFA6C0E075D8800617813 /* PBEasyFS.m in Sources */ = {isa = PBXBuildFile; fileRef = F5DFFA6B0E075D8800617813 /* PBEasyFS.m */; };
+		F5E4DBFB0EAB58D90013FAFC /* SystemConfiguration.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = F5E4DBFA0EAB58D90013FAFC /* SystemConfiguration.framework */; };
 		F5E926060E8827D300056E75 /* PBViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = F5E926050E8827D300056E75 /* PBViewController.m */; };
 		F5E927F80E883E7200056E75 /* PBChangedFile.m in Sources */ = {isa = PBXBuildFile; fileRef = F5E927F70E883E7200056E75 /* PBChangedFile.m */; };
 		F5E927FC0E883F0700056E75 /* PBWebChangesController.m in Sources */ = {isa = PBXBuildFile; fileRef = F5E927FB0E883F0700056E75 /* PBWebChangesController.m */; };
@@ -103,6 +105,7 @@
 		29B97324FDCFA39411CA2CEA /* AppKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AppKit.framework; path = /System/Library/Frameworks/AppKit.framework; sourceTree = "<absolute>"; };
 		29B97325FDCFA39411CA2CEA /* Foundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Foundation.framework; path = /System/Library/Frameworks/Foundation.framework; sourceTree = "<absolute>"; };
 		32CA4F630368D1EE00C91783 /* GitX_Prefix.pch */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = GitX_Prefix.pch; sourceTree = "<group>"; };
+		3F0851CD0EA52D8E00C26EE5 /* md5.js */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.javascript; name = md5.js; path = html/md5.js; sourceTree = "<group>"; };
 		770B37EC0679A11B001EADE2 /* GitTest_DataModel.xcdatamodel */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = wrapper.xcdatamodel; path = GitTest_DataModel.xcdatamodel; sourceTree = "<group>"; };
 		77C82804067257F0000B614F /* CoreData.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreData.framework; path = /System/Library/Frameworks/CoreData.framework; sourceTree = "<absolute>"; };
 		77C8280B06725ACE000B614F /* ApplicationController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ApplicationController.h; sourceTree = "<group>"; };
@@ -181,6 +184,7 @@
 		F5D2DC860EA401A80034AD24 /* PBGitConfig.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = PBGitConfig.m; sourceTree = "<group>"; };
 		F5DFFA6A0E075D8800617813 /* PBEasyFS.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PBEasyFS.h; sourceTree = "<group>"; };
 		F5DFFA6B0E075D8800617813 /* PBEasyFS.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = PBEasyFS.m; sourceTree = "<group>"; };
+		F5E4DBFA0EAB58D90013FAFC /* SystemConfiguration.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = SystemConfiguration.framework; path = /System/Library/Frameworks/SystemConfiguration.framework; sourceTree = "<absolute>"; };
 		F5E926040E8827D300056E75 /* PBViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PBViewController.h; sourceTree = "<group>"; };
 		F5E926050E8827D300056E75 /* PBViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = PBViewController.m; sourceTree = "<group>"; };
 		F5E927F60E883E7200056E75 /* PBChangedFile.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PBChangedFile.h; sourceTree = "<group>"; };
@@ -209,6 +213,7 @@
 				F56526240E03D85900F03B52 /* WebKit.framework in Frameworks */,
 				911112370E5A097800BF76B4 /* Security.framework in Frameworks */,
 				F580E6AE0E733276009E2D3F /* Sparkle.framework in Frameworks */,
+				F5E4DBFB0EAB58D90013FAFC /* SystemConfiguration.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -232,6 +237,7 @@
 		1058C7A0FEA54F0111CA2CBB /* Linked Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				F5E4DBFA0EAB58D90013FAFC /* SystemConfiguration.framework */,
 				F580E6AD0E733276009E2D3F /* Sparkle.framework */,
 				F56526230E03D85900F03B52 /* WebKit.framework */,
 				1058C7A1FEA54F0111CA2CBB /* Cocoa.framework */,
@@ -393,6 +399,7 @@
 		F58A8F250E04368A007E3FC0 /* HTML */ = {
 			isa = PBXGroup;
 			children = (
+				3F0851CD0EA52D8E00C26EE5 /* md5.js */,
 				F5E928540E8841FB00056E75 /* diff.js */,
 				F56526590E03E71B00F03B52 /* commit.html */,
 				F5E9281C0E8840CF00056E75 /* diff.html */,
@@ -537,6 +544,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				F5E928550E8841FB00056E75 /* diff.js in Resources */,
+				3F0851D10EA52E4300C26EE5 /* md5.js in Resources */,
 				F561E6CD0E7AFDDF00521636 /* keyboardNavigation.js in Resources */,
 				F5E92A1B0E88550E00056E75 /* empty_file.png in Resources */,
 				913D5E500E55645900CECEA2 /* gitx in Resources */,
diff --git a/Images/spinner.gif b/Images/spinner.gif
index ddb7ff1..d84f653 100644
Binary files a/Images/spinner.gif and b/Images/spinner.gif differ
diff --git a/PBWebController.m b/PBWebController.m
index 6b8f50e..1c8372c 100644
--- a/PBWebController.m
+++ b/PBWebController.m
@@ -54,4 +54,19 @@
 	NSLog(@"%@", logMessage);
 }
 
+#include <SystemConfiguration/SCNetworkReachability.h>
+
+- (BOOL) isReachable:(NSString *)hostname
+{
+	SCNetworkConnectionFlags flags;
+	if (!SCNetworkCheckReachabilityByName([hostname cStringUsingEncoding:NSASCIIStringEncoding], &flags))
+		return FALSE;
+
+	// If a connection is required, then it's not reachable
+	if (flags & (kSCNetworkFlagsConnectionRequired | kSCNetworkFlagsConnectionAutomatic | kSCNetworkFlagsInterventionRequired))
+		return FALSE;
+
+	return flags > 0;
+}
+
 @end
diff --git a/html/commit.html b/html/commit.html
index f2902ee..c0e66c0 100644
--- a/html/commit.html
+++ b/html/commit.html
@@ -4,18 +4,21 @@
 	<link rel="stylesheet" href="commits.css" type="text/css" media="screen" title="no title" charset="utf-8">
 	<link rel="stylesheet" href="diff_style.css" type="text/css" media="screen" title="no title" charset="utf-8">
 	<script src="prototype.js" type="text/javascript" charset="utf-8"></script>
+	<script src="md5.js" type="text/javascript" charset="utf-8"></script>
 	<script src="commit.js" type="text/javascript" charset="utf-8"></script>
 	<script src="diffHighlighter.js" type="text/javascript" charset="utf-8"></script>
 	<script src="keyboardNavigation.js" type="text/javascript" charset="utf-8"></script>
 </head>
 
 <body style="padding: 0px; border: 0px">
-
-	<div id="notification" style="display:none;">
-		<img src="spinner.gif" width="25px" alt="Spinner" id="spinner"></img>
-		<span id="notification_message"></span>
+	<div id="rightcontent">
+		<div id="buttons">
+			<a class="servicebutton" onClick="gistie();return false" href='#'>
+				Gist&nbsp;it
+			</a>
+		</div>
+		<img id="gravatar" src="">
 	</div>
-	<div id="gistie" onClick="gistie()">Paste online</div>
 	<table id="commit_header">
 	<tr>
 		<td class="property_name">SHA:</td>
@@ -38,7 +41,11 @@
 		<td id="refs"></td>
 	</tr>
 	</table>
+	<div id="notification" style="display:none;">
+		<img src="spinner.gif" alt="Spinner" id="spinner"></img>
+		<div id="notification_message"></div>
+	</div>
 	<hr>
 	<pre id="message"></pre>
 	<pre><code class="diffcode" id='details'></code></pre>
-</body>
\ No newline at end of file
+</body>
diff --git a/html/commit.js b/html/commit.js
index 7ac89c0..8288f8a 100644
--- a/html/commit.js
+++ b/html/commit.js
@@ -38,19 +38,28 @@ var Commit = Class.create({
 	}
 });
 
-var notify = function(text, busy) {
+var notify = function(text, state) {
 	var n = $("notification");
 	n.style.display = "";
-	if (busy)
-		$("spinner").style.display = "";
-	else
-		$("spinner").style.display = "none";
-	
 	$("notification_message").innerHTML = text;
+
+	// Change color
+	if (!state) { // Busy
+		$("spinner").style.display = "";
+		n.setAttribute("class", "");
+	}
+	else if (state == 1) { // Success
+		$("spinner").style.display = "none";
+		n.setAttribute("class", "success");
+	} else if (state == -1) {// Fail
+		$("spinner").style.display = "none";
+		n.setAttribute("class", "fail");
+	}
 }
 
 var gistie = function() {
-	notify("Uploading code to Gistie..", true);
+	notify("Uploading code to Gistie..", 0);
+
 	parameters = {
 		"file_ext[gistfile1]":      "patch",
 		"file_name[gistfile1]":     commit.object.subject.replace(/[^a-zA-Z0-9]/g, "-") + ".patch",
@@ -74,21 +83,34 @@ var gistie = function() {
 
 		onSuccess: function(t) {
 			if (m = t.responseText.match(/gist: ([a-f0-9]+)/))
-				notify("Code uploaded to gistie <a target='_new' href='http://gist.github.com/" + m[1] + "'>#" + m[1] + "</a>");
+				notify("Code uploaded to gistie <a target='_new' href='http://gist.github.com/" + m[1] + "'>#" + m[1] + "</a>", 1);
 			else
-				notify("Pasting to Gistie failed.");
+				notify("Pasting to Gistie failed.", -1);
 		},
 		onFailure: function(t) {
-			notify("Pasting to Gistie failed.");
+			notify("Pasting to Gistie failed.", -1);
 		},
 		onException: function(t) {
-			notify("Pasting to Gistie failed.");
+			notify("Pasting to Gistie failed.", -1);
 		},
 		
 	});
 	
 }
 
+var setGravatar = function(email, image) {
+	if (Controller && !Controller.isReachable_("www.gravatar.com"))
+		return;
+
+	if (!email) {
+		$("gravatar").src = "http://www.gravatar.com/avatar/?d=wavatar&s=60";
+		return;
+	}
+
+	$("gravatar").src = "http://www.gravatar.com/avatar/" +
+		hex_md5(commit.author_email) + "?d=wavatar&s=60";
+}
+
 var selectCommit = function(a) {
 	Controller.selectCommit_(a);
 }
@@ -127,10 +149,12 @@ var loadCommit = function() {
 	$("notification").style.display = "none";
 
 	$("commitID").innerHTML = commit.sha;
+
 	if (commit.author_email)
 		$("authorID").innerHTML = commit.author_name + " &lt;<a href='mailto:" + commit.author_email + "'>" + commit.author_email + "</a>&gt;";
 	else
 		$("authorID").innerHTML = commit.author_name;
+
 	$("date").innerHTML = commit.author_date;
 	$("subjectID").innerHTML =CommitObject.subject.escapeHTML();
 	
@@ -153,5 +177,7 @@ var loadCommit = function() {
 		$("details").innerHTML = "<a class='showdiff' href='' onclick='showDiffs(); return false;'>This is a large commit. Click here or press 'v' to view.</a>";
 	}
 
+	setGravatar(commit.author_email, $("gravatar"));
+
 	scroll(0, 0);
 }
diff --git a/html/commits.css b/html/commits.css
index 9a9a2f4..3eb801f 100644
--- a/html/commits.css
+++ b/html/commits.css
@@ -1,28 +1,74 @@
+body {
+	font-family: 'Lucida Grande';
+}
+
 #commit_header {
 	width: 100%;
-	font-family: Helvetica;
 	font-size: 12px;
 }
 
-#gistie {
-	float: right;
-	margin-right: 100px;
-	color: rgb(20, 79, 174);
-	text-decoration: underline;
+#commit_header td {
+  padding-left: 5px;
 }
 
 #notification {
-	width: 80%;
-	margin: auto;
-	border: 1px solid #A8A159;
-	background-color: #FFF487;
-	font-size: 140%;
-	padding: 10px;
+	margin: 5px;
+	padding: 3px;
+	clear: both;
+
+	border: 1px solid black;
+	background-color: #f3f3f3;
+
+	text-align: center;
+	font-size: 80%;
+
+	-webkit-border-radius: 2px;
 }
 
-#notification img {
-	vertical-align: bottom;
-	margin-right: 10px;
+#notification.success {
+	background-color: #CCFF99;
+	border: 1px solid #99CC66;
+}
+
+#notification.fail {
+	background-color: #ff9999;
+	border: 1px solid #cc6666;
+}
+
+#rightcontent {
+	float: right;
+}
+
+#buttons {
+	float: left;
+	margin-top: 5px;
+}
+
+a.servicebutton{
+	display: block;
+	width: 80px;
+	padding: 2px;
+	margin-bottom: 4px;
+
+	border: 1px solid #3465a4;
+	background-color: #cce5ff;
+	color: #204a87;
+
+	font-size: 65%;
+	text-decoration: none;
+	text-align: center;
+
+	-webkit-border-radius: 2px;
+}
+
+#gravatar {
+	margin: 5px;
+	padding: 2px;
+	width: 60px;
+	height: 60px;
+
+	border: solid gray 1px;
+	-webkit-border-radius: 2px;
 }
 
 .property_name {
@@ -47,8 +93,9 @@
 hr {
 	border: 0;
 	height: 1px;
-	width: 80%;
-	background-color: #999;
+	margin: 0 8px;
+	background-color: #DEDEDE;
+	clear: both;
 }
 
 a {
diff --git a/html/md5.js b/html/md5.js
new file mode 100644
index 0000000..36fc1c2
--- /dev/null
+++ b/html/md5.js
@@ -0,0 +1,256 @@
+/*
+ * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
+ * Digest Algorithm, as defined in RFC 1321.
+ * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
+ * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+ * Distributed under the BSD License
+ * See http://pajhome.org.uk/crypt/md5 for more info.
+ */
+
+/*
+ * Configurable variables. You may need to tweak these to be compatible with
+ * the server-side, but the defaults work in most cases.
+ */
+var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
+var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
+var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */
+
+/*
+ * These are the functions you'll usually want to call
+ * They take string arguments and return either hex or base-64 encoded strings
+ */
+function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
+function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
+function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}
+function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
+function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
+function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }
+
+/*
+ * Perform a simple self-test to see if the VM is working
+ */
+function md5_vm_test()
+{
+  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
+}
+
+/*
+ * Calculate the MD5 of an array of little-endian words, and a bit length
+ */
+function core_md5(x, len)
+{
+  /* append padding */
+  x[len >> 5] |= 0x80 << ((len) % 32);
+  x[(((len + 64) >>> 9) << 4) + 14] = len;
+
+  var a =  1732584193;
+  var b = -271733879;
+  var c = -1732584194;
+  var d =  271733878;
+
+  for(var i = 0; i < x.length; i += 16)
+  {
+    var olda = a;
+    var oldb = b;
+    var oldc = c;
+    var oldd = d;
+
+    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
+    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
+    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
+    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
+    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
+    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
+    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
+    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
+    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
+    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
+    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
+    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
+    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
+    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
+    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
+    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);
+
+    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
+    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
+    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
+    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
+    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
+    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
+    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
+    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
+    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
+    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
+    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
+    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
+    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
+    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
+    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
+    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
+
+    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
+    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
+    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
+    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
+    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
+    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
+    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
+    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
+    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
+    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
+    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
+    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
+    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
+    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
+    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
+    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
+
+    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
+    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
+    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
+    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
+    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
+    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
+    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
+    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
+    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
+    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
+    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
+    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
+    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
+    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
+    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
+    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
+
+    a = safe_add(a, olda);
+    b = safe_add(b, oldb);
+    c = safe_add(c, oldc);
+    d = safe_add(d, oldd);
+  }
+  return Array(a, b, c, d);
+
+}
+
+/*
+ * These functions implement the four basic operations the algorithm uses.
+ */
+function md5_cmn(q, a, b, x, s, t)
+{
+  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
+}
+function md5_ff(a, b, c, d, x, s, t)
+{
+  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
+}
+function md5_gg(a, b, c, d, x, s, t)
+{
+  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
+}
+function md5_hh(a, b, c, d, x, s, t)
+{
+  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
+}
+function md5_ii(a, b, c, d, x, s, t)
+{
+  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
+}
+
+/*
+ * Calculate the HMAC-MD5, of a key and some data
+ */
+function core_hmac_md5(key, data)
+{
+  var bkey = str2binl(key);
+  if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);
+
+  var ipad = Array(16), opad = Array(16);
+  for(var i = 0; i < 16; i++)
+  {
+    ipad[i] = bkey[i] ^ 0x36363636;
+    opad[i] = bkey[i] ^ 0x5C5C5C5C;
+  }
+
+  var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
+  return core_md5(opad.concat(hash), 512 + 128);
+}
+
+/*
+ * Add integers, wrapping at 2^32. This uses 16-bit operations internally
+ * to work around bugs in some JS interpreters.
+ */
+function safe_add(x, y)
+{
+  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
+  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
+  return (msw << 16) | (lsw & 0xFFFF);
+}
+
+/*
+ * Bitwise rotate a 32-bit number to the left.
+ */
+function bit_rol(num, cnt)
+{
+  return (num << cnt) | (num >>> (32 - cnt));
+}
+
+/*
+ * Convert a string to an array of little-endian words
+ * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
+ */
+function str2binl(str)
+{
+  var bin = Array();
+  var mask = (1 << chrsz) - 1;
+  for(var i = 0; i < str.length * chrsz; i += chrsz)
+    bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
+  return bin;
+}
+
+/*
+ * Convert an array of little-endian words to a string
+ */
+function binl2str(bin)
+{
+  var str = "";
+  var mask = (1 << chrsz) - 1;
+  for(var i = 0; i < bin.length * 32; i += chrsz)
+    str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
+  return str;
+}
+
+/*
+ * Convert an array of little-endian words to a hex string.
+ */
+function binl2hex(binarray)
+{
+  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
+  var str = "";
+  for(var i = 0; i < binarray.length * 4; i++)
+  {
+    str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
+           hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
+  }
+  return str;
+}
+
+/*
+ * Convert an array of little-endian words to a base-64 string
+ */
+function binl2b64(binarray)
+{
+  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+  var str = "";
+  for(var i = 0; i < binarray.length * 4; i += 3)
+  {
+    var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
+                | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
+                |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
+    for(var j = 0; j < 4; j++)
+    {
+      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
+      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
+    }
+  }
+  return str;
+}