function popUrl(url, width, height)
{
	LeftPosition = (screen.width) ? (screen.width - width)/2 : 0;
	TopPosition = (screen.height) ? (screen.height - height)/2 : 0;

	settings = 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=' + width + ',height=' + height + ',top=' + TopPosition + ',left=' + LeftPosition;
	win = window.open(url, null, settings);

	if(win.focus){
		win.focus();
	}
}