var chkopen="";
function opendiv(id) {
	if(document.getElementById("navdiv_"+id).style.display=="block") {
		document.getElementById("navdiv_"+id).style.display="none";
		chkopen="";
	} else {
		document.getElementById("navdiv_"+id).style.display="block";
		chkopen=id;
	}
}