function random_imglink(){
  var myimages=new Array()
  myimages[1]="../images/center_image.jpg"
  myimages[2]="../images/center_header2.jpg"
  myimages[3]="../images/center_header3.jpg"
  myimages[4]="../images/center_header4.jpg"
  myimages[5]="../images/center_header5.jpg"
  myimages[6]="../images/center_header6.jpg"

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