var css = new Array("index/top_images/backimg001.css", "index/top_images/backimg002.css", "index/top_images/backimg003.css", "index/top_images/backimg004.css", "index/top_images/backimg005.css", "index/top_images/backimg006.css", "index/top_images/backimg007.css");
var n = Math.random() * css.length;
n = Math.floor(n);
var tag = "<link type='text/css' rel='stylesheet' href='"
  + css[n] + "'>";
document.write(tag);