tag=new Array();

tag[0]='<!-- BM --><a href="maven/bm2010.html"><img src="common/images/topBn02A.jpg" alt="" width="199" height="119" /></a>';
tag[1]='<!-- Life --><a href="think/helpful/lifetime.html"><img src="common/images/topBn02B.jpg" alt="" width="199" height="119" /></a>';

i=Math.floor(Math.random()*tag.length);
                  
document.write(tag[i]);