function isIE()
{
    if(navigator.userAgent.match(/MSIE \d\.\d+/))
        return true;
    return false;
}

function zIndexWorkaround() {
    // If the browser is IE,
    if(isIE())
    {
        /*
        ** For each div with class menu (i.e.,
        ** the thing we want to be on top),
        */
        $("ul.dropdown").parents().each(function() {
            var p = $(this);
            var pos = p.css("position");

            // If it's positioned,
            if(pos == "relative" ||
               pos == "absolute" ||
               pos == "fixed")
            {
                /*
                ** Add the "on-top" class name when the
                ** mouse is hovering over it, and remove
                ** it when the mouse leaves.
                */
                p.hover(function() {
                        $(this).addClass("on-top");
                    },
                    function() {
                        $(this).removeClass("on-top");
                    });
            }
        });
    }
}
$(document).ready(zIndexWorkaround);