var one0, one1, two0, two1, three0, three1, four0, four1;
  
  window.onerror = null;
  var netscape = 0;
  var goodIE = 0;
  
  browserName = navigator.appName.substring(0,8);
  browserVer = parseFloat(navigator.appVersion);
  if (browserName == "Netscape" && browserVer >= 3)
  { netscape = 1; }
  if (browserName == "Microsof" && browserVer >= 4)
  { goodIE = 1; }
  
  if (netscape || goodIE) {
  
  one0 = new Image(75,73);
  one0.src = "/images/signup_a.gif";
  one1 = new Image(75,73);
  one1.src = "/images/signup_b.gif";
  
  two0 = new Image(25,24);
  two0.src = "/images/rss.gif";
  two1 = new Image(25,24);
  two1.src = "/images/rss_ylw.gif";
  
  three0 = new Image(75,73);
  three0.src = "/images/twitter-top.gif";
  three1 = new Image(75,73);
  three1.src = "/images/twitter-top-ylw.gif";
  
  four0 = new Image(25,24);
  four0.src = "/images/facebook-top.gif";
  four1 = new Image(25,24);
  four1.src = "/images/facebook-top-ylw.gif";
  }
  
  function switchimage (imgname, target)
  {
   if (netscape || goodIE) document.images[imgname].src = target.src;
  }