function openWindow(file, name, width, height) {
	var left = width != "" ? (screen.width - width) / 2 : 0;
	var top = height != "" ? (screen.height - height) / 2 : 0;
	window.open(file, name, "location=no, menubar=no, tool=no, statusbar=no, resizable=yes, scrollbars=yes, width="+width+", height="+height+", left="+left+", top="+top);
}