activateMenu = function(nav) {

        /* currentStyle restricts the Javascript to IE only */
                if (document.all &&
         document.getElementById(nav).currentStyle) {
                var navroot = document.getElementById(nav);

                /* Get all the list items within the menu */

                var lis=navroot.getElementsByTagName("LI");
                for (i=0; i<lis.length; i++) {

                   /* If the LI has another menu level */
                    if(lis[i].lastChild.tagName=="UL"){

                        /* assign the function to the LI */
                             lis[i].onmouseover=function() {


                           /* display the inner menu */
                           this.lastChild.style.display="block";
                           this.lastChild.style.zindex=50;

                        }
                        lis[i].onmouseout=function() {
                           this.lastChild.style.display="none";
                        }
                    }
                }
            }
        }