ieHover = function() {
            var ieLIs = document.getElementById('main-nav').getElementsByTagName('li');
            for (var i=0; i<ieLIs.length; i++) if (ieLIs[i]) {
                ieLIs[i].onmouseover=function() {
                var ieUL = this.getElementsByTagName('ul')[0];
                if (ieUL) {
                var ieMat = document.createElement('iframe');
                                ieMat.style.width=ieUL.offsetWidth+"px";
                                ieMat.style.height=ieUL.offsetHeight+"px";    
                                ieUL.insertBefore(ieMat,ieUL.firstChild);
                                ieUL.style.zIndex="99";
                                }
                    
                    this.className+=" iehover";
                    }
                ieLIs[i].onmouseout=function() {
                var ieUL = this.getElementsByTagName('ul')[0];
                if (ieUL) { ieUL.removeChild(ieUL.firstChild); }
                    this.className=this.className.replace(' iehover', '');
                    }
                    }
            }
        if (window.attachEvent) window.attachEvent('onload', ieHover);