fValidVer = 
   (((navigator.appName == "Netscape") && 
   (parseInt(navigator.appVersion) >= 3 )) || 
   ((navigator.appName == "Microsoft Internet Explorer") && 
   (parseInt(navigator.appVersion) >= 4 )));

  if (document.images){
   <!--BUTTONS-->
   var close_normal = new Image;
   close_normal.src = "button_close.gif";
   var close_hover = new Image;
   close_hover.src = "button_close_hover.gif";

   var infosm_normal = new Image;
   infosm_normal.src = "button_infosm.gif";
   var infosm_hover = new Image;
   infosm_hover.src = "button_infosm_hover.gif";

   var email_normal = new Image;
   email_normal.src = "button_email.gif";
   var email_hover = new Image;
   email_hover.src = "button_email_hover.gif";

   var home_normal = new Image;
   home_normal.src = "button_home.gif";
   var home_hover = new Image;
   home_hover.src = "button_home_hover.gif";

   var search_normal = new Image;
   search_normal.src = "button_search.gif";
   var search_hover = new Image;
   search_hover.src = "button_search_hover.gif";
   
   var links_normal = new Image;
   links_normal.src = "button_links.gif";
   var links_hover = new Image;
   links_hover.src = "button_links_hover.gif";

   var top_normal = new Image;
   top_normal.src = "button_top.gif";
   var top_hover = new Image;
   top_hover.src = "button_top_hover.gif";
  }

  function Swap(image1, image2) {
   if (document.images)
   	document.images[image1].src = eval(image2 + ".src");
  }