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

  if (document.images)
  {
        var normal = new Image;
        var hover = new Image;
        var click = new Image;
        var viewguest_n = new Image; 
        var viewguest_h = new Image;
        var viewguest_c = new Image;
        viewguest_n.src = img_path + "/viewguest_normal_button.gif";
        viewguest_h.src = img_path + "/viewguest_hover_button.gif";
        viewguest_c.src = img_path + "/viewguest_click_button.gif";
        var signguest_n = new Image; 
        var signguest_h = new Image;
        var signguest_c = new Image;
        signguest_n.src = img_path + "/signguest_normal_button.gif";
        signguest_h.src = img_path + "/signguest_hover_button.gif";
        signguest_c.src = img_path + "/signguest_click_button.gif";
  }

  function Swap(image1, image2)
  {     
    if (image1 == "viewguest")
    {
        normal = viewguest_n;
        hover = viewguest_h;
        click = viewguest_c;
    }      
    if (image1 == "signguest")
    {
        normal = signguest_n;
        hover = signguest_h;
        click = signguest_c;
    }           
    if (document.images)
          document.images[image1].src = eval(image2 + ".src");
  }