function mainmenu(){
$(" #nav ul ").css({display: "none"}); // Opera Fix
$(" #nav li").hover(function(){
		$(this).find('ul:first').css({visibility: "visible",display: "none"}).show(400);
		},function(){
		$(this).find('ul:first').css({visibility: "hidden"});
		});
}

 
 
 $(document).ready(function(){					
	mainmenu();
});
 
 
 //new
 
  <!--//--><![CDATA[//><!--
    activateMenu = function(nav) {
	    if(document.all && document.getElementById(nav).currentStyle){
	        // only MSIE supports document.all
            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";
                    }
                }
            }
        }
    }
    window.onload=function(){
        // pass the function the id of the top level UL
        // remove one, when only using one menu
        activateMenu('dmenu');
    }
   //--><!]]>