function popup(url, width, height, target)
{
	var argLen = arguments.length;
	
	if (argLen < 4)
	{
		target = "";
		if (argLen < 3)
		{
			height = 350;
			if (argLen < 2)
			{
				width  = 400;
				if (argLen < 1)
				{
					return;
				}
			}
		}
	
	}

	var popWin = window.open(url, target, "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=" + width + ",height=" + height);
	if (window.focus) {popWin.focus();}
	return false;
}