function random_imglink(){
var myimages=new Array()
myimages[1]="/isi2007/templates/isi/images/topo3a.jpg"
myimages[2]="/isi2007/templates/isi/images/topo3b.jpg"
myimages[3]="/isi2007/templates/isi/images/topo3c.jpg"
myimages[4]="/isi2007/templates/isi/images/topo3d.jpg"

var ry=Math.floor(Math.random()*myimages.length)
if (ry==0)
ry=1

document.write('<td width=291 height=125 background="'+myimages[ry]+'">')
}
random_imglink()