// Image swaping
var btype = navigator.appName;
var bver = parseInt(navigator.appVersion);
var rolloversupport = true;
if (btype == "Microsoft Internet Explorer" && bver < 4 || bver < 3) {rolloversupport = false;}
function imageswap(field, newimage) {
  if (rolloversupport) {field.src = newimage;}
}