[jQuery] Invalid Argument Error (IE) when getting "width" property

[jQuery] Invalid Argument Error (IE) when getting "width" property


The following script works fine in all other browsers (centering a
nested img). On IE I get the following error message:
Line: 13
Char: 12949
Error: Invalid argument.
Code: 0
I narrowed it down to the line:
    var i = $("#tabs-1a").css("width");
It appears ie doesn't like the "width" property but I don't know why.
Here is the whole script for the page:
$(function(){
    $("#FraudVideo").tabs();
    $("#TipsNews").tabs();
    var i = $("#tabs-1a").css("width");
    var num = parseFloat(i,10);
    var p = num-313;
    var l = p/2;
    $("#tabs-1a img").css("margin-left",l);
    $(window).resize(function(){
        var i=$("#tabs-1a").css("width");
        var num = parseFloat(i,10);
        var p = num-313;
        var l = p/2;
        $("#tabs-1a img").css("margin-left",l);
    });
});
Here is the page:
http://www.wcassist.com/FraudCenter_1.html
Thanks a bunch!
John