brosnam = navigator.appName;
brosver = parseInt(navigator.appVersion);
if ((brosnam == "Netscape" 
    || brosnam == "Microsoft Internet Explorer")
    && brosver >= 3)
        ver = "n3";
else
        ver = "e3";

function swapThese (nam, newnum) {
  if (ver == "n3")
    document[nam].src = "../buttons/" + nam + newnum + ".gif";      
}