r = 4;//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('big<SCRIPT SRC="/Ads/tc/tt6.js"></SCRIPT>');
            break;
        case 2:
            document.write('us<SCRIPT SRC="/Ads/tc/tt2.js"></SCRIPT>');
            break;
        case 3:
            document.write('ads8<SCRIPT SRC="/Ads/tc/tt1.js"></SCRIPT>');	
            break;
        case 4:
            document.write('big<SCRIPT SRC="/Ads/tc/tt4.js"></SCRIPT>');  
            default:
            break;
	} 



document.writeln("<script type=\"text\/javascript\"> \/*120*270，创建于2010-6-2*\/ var cpro_id = \'u39411\';<\/script>");
document.writeln("<script type=\"text\/javascript\" src=\"http:\/\/cpro.baidu.com\/cpro\/ui\/f.js\"><\/script>");
document.writeln("")