function popup(url, wPercentage, hPercentage) {
	var hScreen = screen.availHeight;

	if (! wPercentage) wPercentage = 50;
	if (! hPercentage) hPercentage = 50;

	var w = parseInt(hScreen / (100 / wPercentage));
	var h = parseInt(hScreen / (100 / hPercentage));
	var t = parseInt((hScreen / 2) - (h / 2));
	var l = parseInt((hScreen / 2) - (w / 4));
	
	var params = 'toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no,width='+ w +',height='+ h +',top='+ t +',left='+ l +'';
	var newWindow = window.open(url, 'newWindow', params);
	
	if (newWindow.opener == null) {
		newWindow.opener = window;
	}
	
	newWindow.focus();
}

function popupFixed(url, w, h) {
	var hScreen = screen.availHeight;

	if (! w) w = 100;
	if (! h) h = 100;

	var t = parseInt((hScreen / 2) - (h / 2));
	var l = parseInt((hScreen / 2) - (w / 4));
	
	var params = 'toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no,width='+ w +',height='+ h +',top='+ t +',left='+ l +'';
	var newWindow = window.open(url, 'newWindow', params);
	
	if (newWindow.opener == null) {
		newWindow.opener = window;
	}
	
	newWindow.focus();
}