slider handle jumps few pixels right or left if it's clicked on it

slider handle jumps few pixels right or left if it's clicked on it


If the slider has a larger with then the default and has a range
specified and it's clicked on the handle jumps few pixels to the left
or right.
This problem occurs when I specify the width of the handle(and also
it's left margin to center it) in pixels or ems.
When I specify it with %, then the problem doesn't occur in Chrome or
Opera, but in IE and Firefox it still jumps few pixels.