function topimg(){
var imglist = new Array;
  imglist[0] ="images/header03.jpg";
  imglist[1] ="images/header02.jpg";
  imglist[2] ="images/header01.jpg";
  imglist[3] ="images/header05.jpg";
  imglist[4] ="images/header04.jpg";
var selectnum = Math.floor((Math.random() * 100)) % imglist.length;
var output = '<img border=0 src="'+ imglist[selectnum] +'" galleryimg=\"no\">';
document.write(output);
}