var divs = new Array();
divs[divs.length] = "1";
divs[divs.length] = "2";
divs[divs.length] = "3";
divs[divs.length] = "4";
divs[divs.length] = "5";

function showImage() {
  i = parseInt(Math.random()*divs.length);
  if(document.all) document.all["body"+divs[i]].style.visibility="visible";
  if(document.layers) {
    document.layers["body"+divs[i]].visibility="visible";
    self.blur();
  }
}