if(navigator.appName=="Microsoft Internet Explorer")
{
        sfHover = function()
        {
                var sfEls;
                if(document.getElementById('mainNav')!=null && !isUndefined(document.getElementById('mainNav')))
                        sfEls = document.getElementById('mainNav').getElementsByTagName("LI");

                for(var i=0; i<sfEls.length; i++)
                {
                        sfEls[i].onmouseover=function()
                        {
                                this.className+=" sfhover";
                        }
                       sfEls[i].onmouseout=function()
                        {
                                this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
                        }
                }
        }

        if(window.attachEvent)
                window.attachEvent("onload", sfHover);
}