function popup(fer,w,h) {
	if (!w) w = 700;
	if (!h) h = 500;
	var left = screen.availWidth / 2 - w / 2;
	var top = screen.availHeight / 2 - h / 2;
	
	window.open( fer , '', 'width='+w+',height='+h+',scrollbars=yes,status=no,toolbars=no,menubar=no,resizable=yes,left=' + left + ',top=' + top);
}

function confirm_link(url,message) {
	if (confirm(message)) {
		location.href=base_href+url;
	}
}

function quit(url)
{
	location.href=base_href+url;
}