function random_imglink(){
var myimages=new Array()

//images 
myimages[1]="Coop_CK_900x120.gif"
myimages[2]="rent_index.gif"

//corresponding links
var imagelinks=new Array()
imagelinks[1]="co-op.php"
imagelinks[2]="advertising.php"


var ry=Math.floor(Math.random()*myimages.length)
if (ry==0)
ry=1
document.write('<a href='+'"'+imagelinks[ry]+'"'+'><img src="'+myimages[ry]+'" border=0></a>')
}
random_imglink()