diff --git a/ui/jquery.ui.core.js b/ui/jquery.ui.core.js
index 364d7b668e6..f040ef5e1d1 100644
--- a/ui/jquery.ui.core.js
+++ b/ui/jquery.ui.core.js
@@ -115,59 +115,20 @@ $.fn.extend({
 		}
 
 		return 0;
-	}
-});
-
-(function() {
-	var elem = document.createElement( "div" ),
-		style = elem.style,
-		userSelectProp = "userSelect" in style && "userSelect";
+	},
+	
+	disableSelection: function() {
+		return this.bind(
+			"mousedown.ui-disableSelection selectstart.ui-disableSelection",
+			function( event ) {
+				event.preventDefault();
+			});
+	},
 
-	if ( !userSelectProp ) {
-		$.each( [ "Moz", "Webkit", "Khtml" ], function( i, prefix ) {
-			var vendorProp = prefix + "UserSelect";
-			if ( vendorProp in style ) {
-				userSelectProp = vendorProp;
-				return false;
-			}
-		});
+	enableSelection: function() {
+		return this.unbind( ".ui-disableSelection" );
 	}
-	var selectStart = !userSelectProp && "onselectstart" in elem && "selectstart.mouse";
-
-	elem = null;
-
-	$.fn.extend({
-		disableSelection: function() {
-			if ( userSelectProp ) {
-				this.css( userSelectProp, "none" );
-			} else {
-				this.find( "*" ).andSelf().attr( "unselectable", "on" );
-			}
-
-			if ( selectStart ) {
-				this.bind( selectStart, function() {
-					return false;
-				});
-			}
-
-			return this;
-		},
-
-		enableSelection: function() {
-			if ( userSelectProp ) {
-				this.css( userSelectProp, "" );
-			} else {
-				this.find( "*" ).andSelf().attr( "unselectable", "off" );
-			}
-
-			if ( selectStart ) {
-				this.unbind( selectStart );
-			}
-
-			return this;
-		}
-	});
-})();
+});
 
 $.each( [ "Width", "Height" ], function( i, name ) {
 	var side = name === "Width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ],