Simulate scroll event using Javascript

I am trying to Simulate a scroll event using Javascript for Mobile Safari. I am using the following code

var evt = document.createEvent("MouseEvents");    
evt.initMouseEvent("scroll", true, true, window,0, 0, 0, 0, 0, false, false, false, false, 0, null);

The above code is part of a jQuery plugin jQuery.UI.Ipad which basically maps touch events like touchstart, touchmove, touchend to mouse events like mouseover, mousedown, etc

However for some reasons the code for simulating a scroll event is not working... Please help me. So essentially my question is how do I simulate the scroll event.