function random_imglink(){
  var myimages=new Array()
  myimages[1]="5"
  myimages[2]="6"
  var ry=Math.floor(Math.random()*myimages.length)
  if (ry==0)
     ry=1
document.write('<style type="text/css">#banner{background:url(_lib/banner/'+myimages[ry]+'.jpg) no-repeat 1px 1px #F2F2F2;}</style>')}
random_imglink()