var menuIDs = ["menu-dropdown-data"] 		// comma-separated menu ids

function menu_dropdown_control(){
	var i
	var j
	var t
	for (i=0; i<menuIDs.length; i++){
		t=document.getElementById(menuIDs[i]).getElementsByTagName("ul")
		for (j=0; j<t.length; j++){
			t[j].style.top=t[j].parentNode.offsetHeight+"px"
			t[j].parentNode.onmouseover = function(){
				this.getElementsByTagName("ul")[0].style.visibility="visible"
	    	}
			t[j].parentNode.onmouseout = function(){
				this.getElementsByTagName("ul")[0].style.visibility="hidden"
			}
		}
	}
}

if (window.addEventListener)						// other browsers
	window.addEventListener("load", menu_dropdown_control, false)
else if (window.attachEvent)						// internet explorer
	window.attachEvent("onload", menu_dropdown_control)