function showsub(menuToShow){
	var umenues = new Array("umenu2", "umenu4");
	var menues = new Array("menu2", "menu4");
	
	if(document.getElementById( umenues[menuToShow] ).style.display == "list-item"){
		document.getElementById( umenues[menuToShow] ).style.display = "none";
		document.getElementById( menues[menuToShow] ).style.background = 'transparent url("img/pil1.gif") left center no-repeat';	
	} else {
		for (i = 0; i < 2; i++){
			document.getElementById( umenues[i] ).style.display = "none";
			document.getElementById( menues[i] ).style.background = 'transparent url("img/pil1.gif") left center no-repeat';
		}
		document.getElementById( umenues[menuToShow] ).style.display = "list-item";
		document.getElementById( menues[menuToShow] ).style.background = 'transparent url("img/pil2.gif") left center no-repeat';
	}
}