var banner=new Array()
banner[0]='<img src=" http://images.ibsrv.net/ibsrv/res/src:www.vetinfo.com/get/images/image_rotator/cat_3.jpg" width="130" border="0" class="ads">'
banner[1]='<img src=" http://images.ibsrv.net/ibsrv/res/src:www.vetinfo.com/get/images/image_rotator/cat_4.jpg" width="130" border="0" class="ads">'
var whichbanner=Math.floor(Math.random()*(banner.length))
document.write(banner[whichbanner])