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ad[7]='http://dl.birup.com/birbuy/Baner/baner2012.gif';

var links=new Array() 

links[0]='http://1.birbuy.com/content-97.html';
links[1]='http://1.birbuy.com/content-92.html';
links[2]='http://1.birbuy.com/content-102.html';
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var xy=Math.floor(Math.random()*ad.length);
document.write('<a href="'+links[xy]+'" target="_blank"><img src="'+ad[xy]+'" width="'+img_width+'" height="'+img_height+'" border="0"></a>');