diff --git a/jquery.mousewheel.js b/jquery.mousewheel.js
old mode 100644
new mode 100755
index 528defee0..18bc5342f
--- a/jquery.mousewheel.js
+++ b/jquery.mousewheel.js
@@ -50,6 +50,7 @@ $.fn.extend({
 function handler(event) {
     var orgEvent = event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
     
+    var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
     event = $.event.fix(event || window.event);
     event.type = "mousewheel";