function popUpCenteredWindow(url) {
	var iMyWidth;
	var iMyHeight;
	iMyWidth = (window.screen.width/2) - (288 + 10); //half the screen width minus half the new window width (plus 5 pixel borders).
	iMyHeight = (window.screen.height/2) - (216 + 50); //half the screen height minus half the new window height (plus title and status bars).
	var win2 = window.open(url,"Window2","status,height=432,width=576,resizable=yes,left=" + iMyWidth + ",top=" + iMyHeight + ",screenX=" + iMyWidth + ",screenY=" + iMyHeight + ",scrollbars=yes");
}