function optionMenu(nid,id){
    var ulValue = document.getElementById("navList").childNodes;
    var navValue = document.getElementById("znav").childNodes;
	for(i=0; i<ulValue.length; i++){
	    if (ulValue[i].id == id) 
	        ulValue[i].className = "show";
	    else 
	        ulValue[i].className = "hide";
	}
	for(j=0;j<navValue.length;j++)
	{
	    if(navValue[j].id == nid)
	        navValue[j].className = "hoverbg";
	    else
	        navValue[j].className = "bg";
	}
}