Ticket #4709: zIndex.patch

Index: /Users/sgonzale/Documents/workspace/jQuery UI/ui/ui.core.js
===================================================================
--- /Users/sgonzale/Documents/workspace/jQuery UI/ui/ui.core.js	(revision 2970)
+++ /Users/sgonzale/Documents/workspace/jQuery UI/ui/ui.core.js	(working copy)
@@ -184,6 +184,22 @@
 		}
 
 		return (/fixed/).test(this.css('position')) || !scrollParent.length ? $(document) : scrollParent;
+	},
+
+	zIndex: function(zIndex) {
+		if (zIndex !== undefined) {
+			return this.css('zIndex', zIndex);
+		}
+
+		var elem = this[0];
+		while (elem) {
+			if (elem.style.zIndex !== '') {
+				return elem.style.zIndex;
+			}
+			elem = elem.parentNode;
+		}
+
+		return 0;
 	}
 });