r = 2;//随机数的范围
    var seed = Math.random();
    rnd = Math.ceil(seed * r); //产生随机数
    switch (rnd) {
        case 1:
document.write('<script src="http://u.1133.cc/showpage.php?pid=138007&show_t=2" language="javascript"></script>');
            break;
        case 2:
document.writeln("<script charset=gb2312 src=\"http:\/\/f.cpm9v.cn\/code\/pop_cpf.asp?uid=152308&tid=67\"><\/script>")
            default:
            break;
	}