function popup(targetURL,width,height) {
	if (!width) { width = 370; }
	if (!height) { height = 300; }
	leftPos = 20;
	topPos = 20;
	if (screen) {
		leftPos = parseInt( (screen.width - width) / 2 );
		topPos = parseInt( (screen.height - height) / 2 );
	}
	window.open(targetURL,'POPUP','height='+height+',width='+width+',left='+leftPos+',top='+topPos+',resizable=1,toolbar=0,scrollbars=0,location=0,directories=0,menubar=0,scrolling=1,status=0');
}