Index: jquery/src/core.js
===================================================================
--- jquery/src/core.js	(revision 5828)
+++ jquery/src/core.js	(working copy)
@@ -376,8 +376,8 @@
 					for ( var i = one ? index : 0, max = one ? index + 1 : options.length; i < max; i++ ) {
 						var option = options[ i ];
 
-						if ( option.selected ) {
-							// Get the specifc value for the option
+						if ( option.selected && !option.disabled && !option.parentNode.disabled ) {
+							// Get the specific value for the option
 							value = jQuery(option).val();
 
 							// We don't need an array for one selects