var j,l="",m="",p="",q="",z="",list= new Array()
  list[list.length]='it/img_index/bk7.jpg';
  list[list.length]='it/img_index/bk6.jpg';  
  list[list.length]='it/img_index/bk5.jpg';
  list[list.length]='it/img_index/bk4.jpg';
  list[list.length]='it/img_index/bk3.jpg';
  list[list.length]='it/img_index/bk2.jpg';
  list[list.length]='it/img_index/bk1.jpg';
  j=parseInt(Math.random()*list.length);
  j=(isNaN(j))?0:j;
    document.write("<img src='"+list[j]+"'>");