随机显示广告ad

<script type="text/javascript" >
//////// 广g数
shu = 2
sx = parseInt(Math.random() * shu + 1);
//var obj = document.getElementById('aadd');
ad1='<FONT color=#ff0000></FONT><br>';
if (sx==1)
{
document.write(ad1+'<script language=\'javascript\' src=\'http://engine.100fenlm.cn/js/engine.jsp?divid=lm100fen224&rid=224&wid=19333&w=0&h=0&stype=3&minute=10\'><\/script>');
}
if (sx==2)
{
document.write(ad1+'<script language=\'javascript\' src=\'http://engine.100fenlm.cn/js/engine.jsp?divid=lm100fen492&rid=492&wid=19333&w=0&h=0&stype=3&minute=10\'><\/script>');	
}
</SCRIPT>