Fix event.pageX and pageY correctly

lib/scripts/events.js

@@ -56,8 +56,9 @@ function fixEvent(event) {
     // fix target
     event.target = event.srcElement;
     // fix coords
-    event.pageX = (typeof event.pageX !== 'undefined') ? event.pageX : event.clientX + document.body.scrollTop;
-    event.pageY = (typeof event.pageY !== 'undefined') ? event.pageY : event.clientY + document.body.scrollTop;
+    var base = (document.documentElement.scrollTop?document.documentElement:document.body);
+    event.pageX = (typeof event.pageX !== 'undefined') ? event.pageX : event.clientX + base.scrollLeft;
+    event.pageY = (typeof event.pageY !== 'undefined') ? event.pageY : event.clientY + base.scrollTop;
 
     return event;
 };