function NewWindow(mypage, myname, w, h, scroll) 
{
  var winl = (screen.width - w) / 2;
  var wint = (screen.height - h) / 2;
  winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable,toolbar=yes'
  win = window.open(mypage, myname, winprops)

  if(parseInt(navigator.appVersion) >= 4) 
    win.window.focus();
}

function doPic(imgName, imageName) 
{
  browserName = navigator.appName;
  browserVer = parseInt(navigator.appVersion);

  ns3up = (browserName == "Netscape" && browserVer >= 3);
  ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);

  if (ns3up || ie4up) 
  {
    imgOn = ("" + imgName);
    document.getElementById(imageName).src = imgOn;
  }
}