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

}

//document.onkeypress=keypress;
window.onload= function(){
   /* pass the function the id of the top level UL
   remove one, when only using one menu */
   activateMenu('menu-topnav');
}