function switchmenu( menuid, maincat ){
	
	var submenu = "sub"+menuid;
	var objSub = document.getElementById(submenu);
	
	if(objSub.style.display == "none"){
		objSub.style.display = "block";
		document.getElementById('cat'+menuid).className = "cat_on";
	}else{
		objSub.style.display = "none";
		document.getElementById('cat'+menuid).className = "cat_off";
	}

}