[jQuery] why mouse position inside div is different in Firefox and IE

[Latha]

I am having h3 tag containing anchor tag , i want to know the position
of the mouse while hover.
Why the following works differently in IE and FF.

        var x = e.pageX - this.offsetLeft;
        var y = e.pageY - this.offsetTop;
Can anyone give me the solution for this issue to fix in IE and FF