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

  myimages[1]="http://www.tudorondonia.com/banners/pref_ariquemes_iptu_2010.gif"
  myimages[2]="http://www.tudorondonia.com/banners/pref_ariquemes_iptu_2010.gif"

  var imagelinks=new Array()
  imagelinks[1]="http://www.ariquemes.ro.gov.br/"
  imagelinks[2]="http://www.ariquemes.ro.gov.br/"

  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()