function showsubnav(navnumb) {
	document.getElementById("subnav_"+navnumb).style.visibility = "visible";
}
function hidesubnav(navnumb) {
	document.getElementById("subnav_"+navnumb).style.visibility = "hidden";
}
function popup(width,height,url) {
	window.open(url,'','width='+width+', height='+height+', toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes');
}