//open popup window
function openWindow(url, name, width, height) {
	if (!url) {return false;}

	if (!name) {name = "popupwin";}
	if (!width) {width = 800;}
	if (!height) {height = 600;}

	properties = 'toolbar=0';
	properties += ', scrollbars=0';
	properties += ', location=0';
	properties += ', statusbar=0';
	properties += ', menubar=0';
	properties += ', resizable=1';
	properties += ', width=' + width;
	properties += ', height=' + height;
	properties += ', left=50';
	properties += ', top=50';

	window.open(url, name, properties);
}