function openWindow(URL, windowName, windowWidth, windowHeight) {
	windowTop = (screen.height - windowHeight) / 2;
	windowLeft = (screen.width - windowWidth) / 2;
	windowAppearance = "toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width="+windowWidth+",height="+windowHeight+",top="+windowTop+",left="+windowLeft;
	page = window.open(URL, windowName, windowAppearance);
}