bg = new Array(); 
link=new Array();
title=new Array();

bg[0] = 'http://www.168-net.com/program/news/banner/1.jpg';
bg[1] = 'http://www.168-net.com/program/news/banner/3.gif';
bg[2] = 'http://www.168-net.com/program/news/banner/1.jpg';
bg[3] = 'http://www.168-net.com/program/news/banner/3.gif';
bg[4] = 'http://www.168-net.com/program/news/banner/3.gif';

link[0]='http://www.168-net.com';
link[1]='http://huojia.168-net.com';
link[2]='http://www.168-net.com';
link[3]='http://huojia.168-net.com';
link[4]='http://huojia.168-net.com';

title[0]='金网驿站';
title[1]='中国货架大全';
title[2]='金网驿站';
title[3]='中国货架大全';
title[4]='中国货架大全';

index = Math.floor(Math.random() * bg.length);
document.write("<a href="+link[index]+" target=_blank title="+title[index]+">");
document.write("<img src="+bg[index]+" border=0></a>");