Patch for jQuery ticket #1954 using support.js

ie7-button-value.patch

diff --git a/src/attributes.js b/src/attributes.js
index 5997210..297bcc2 100644
--- a/src/attributes.js
+++ b/src/attributes.js
@@ -31,7 +31,11 @@ jQuery.fn.extend({
 		return this.each(function(){
 			jQuery.attr( this, name, "" );
 			if ( this.nodeType === 1 ) {
-				this.removeAttribute( name );
+				if ( !jQuery.support.buttonValue && name === "value" && jQuery.nodeName( this, "button" ) ) {
+					this.removeAttributeNode(this.getAttributeNode( name ));
+				} else {
+					this.removeAttribute( name );
+				}
 			}
 		});
 	},
@@ -211,6 +215,10 @@ jQuery.fn.extend({
 					return elem.getAttribute("value") === null ? "on" : elem.value;
 				}
 
+				if ( !jQuery.support.buttonValue && jQuery.nodeName( elem, "button" ) ) {
+					return elem.getAttributeNode( "value" ) ? elem.getAttributeNode( "value" ).nodeValue : "";
+				}
+
 				// Everything else, we just grab the value
 				return (elem.value || "").replace(rreturn, "");
 
@@ -257,6 +265,17 @@ jQuery.fn.extend({
 					this.selectedIndex = -1;
 				}
 
+			} else if ( !jQuery.support.buttonValue && jQuery.nodeName( this, "button" ) ) {
+				var attributeNode = this.getAttributeNode( "value" );
+
+				if (attributeNode) {
+					attributeNode.nodeValue = val;
+				} else {
+					attributeNode = document.createAttribute( "value" );
+					attributeNode.nodeValue = val;
+					this.setAttributeNode( attributeNode );
+				}
+
 			} else {
 				this.value = val;
 			}
@@ -323,7 +342,22 @@ jQuery.extend({
 
 					if ( value === null ) {
 						if ( elem.nodeType === 1 ) {
-							elem.removeAttribute( name );
+							if ( !jQuery.support.buttonValue && name === "value" && jQuery.nodeName( elem, "button" ) ) {
+								elem.removeAttributeNode(elem.getAttributeNode( name ));
+							} else {
+								elem.removeAttribute( name );
+							}
+						}
+
+					} else if ( !jQuery.support.buttonValue && name === "value" && jQuery.nodeName( elem, "button" ) ) {
+						var attributeNode = elem.getAttributeNode( name );
+
+						if (attributeNode) {
+							attributeNode.nodeValue = value;
+						} else {
+							attributeNode = document.createAttribute("value");
+							attributeNode.nodeValue = value;
+							elem.setAttributeNode(attributeNode);
 						}
 
 					} else {
@@ -336,6 +370,10 @@ jQuery.extend({
 					return elem.getAttributeNode( name ).nodeValue;
 				}
 
+				if ( !jQuery.support.buttonValue && name === "value" && jQuery.nodeName( elem, "button" ) ) {
+					return elem.getAttributeNode( name ) ? elem.getAttributeNode( name ).nodeValue : "";
+				}
+
 				// elem.tabIndex doesn't always return the correct value when it hasn't been explicitly set
 				// http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/
 				if ( name === "tabIndex" ) {
diff --git a/src/support.js b/src/support.js
index 7470b33..c99b786 100644
--- a/src/support.js
+++ b/src/support.js
@@ -7,7 +7,7 @@
 	var div = document.createElement("div");
 
 	div.style.display = "none";
-	div.innerHTML = "   <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
+	div.innerHTML = "   <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/><button>a</button>";
 
 	var all = div.getElementsByTagName("*"),
 		a = div.getElementsByTagName("a")[0],
@@ -54,6 +54,10 @@
 		// (WebKit defaults to "" instead)
 		checkOn: input.value === "on",
 
+		// Make sure that button values are reported correctly
+		// (IE7 returns innerHTML instead)
+		buttonValue: div.getElementsByTagName("button")[0].value === "",
+
 		// Make sure that a selected-by-default option has a working selected property.
 		// (WebKit defaults to false instead of true, IE too, if it's in an optgroup)
 		optSelected: opt.selected,