If I understood you correctly you need to find out the element over the mouse is currently on. If this is correct you can use
document.elementFromPoint ( x, y );
document.elementFromPoint
Returns the element from the document
whose elementFromPoint method is being
called which is the topmost element
which lies under the given point. The
point is specified via coordinates, in
CSS pixels, relative to the
upper-left-most point in the window or
frame containing the document.
$(document).ready(function(){
$(this).mousemove(function(e){
var elem = document.elementFromPoint ( e.pageX , e.pageY );
alert ( elem.id );
});
})
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