Sometimes it will be different when use margin and padding in IE6,IE7 and FF2
It’s good to write in CSS:

.ie_margin{border:1px solid #ff9000;margin-right:0px;}
*+html .ie_margin{border:1px solid #ff9000;margin-right:0px;}
*html .ie_margin{border:1px solid #ff9000;margin-right:18px;}

And to wirte in JS:

$(“#user_image”).addClass(“ie_margin”);
$(“#user_image”).mouseover(function(){
$(this).removeClass(“ie_margin”);
}).mouseout(function(){
$(this).addClass(“ie_margin”);
});

It acts good.

css