function track_screen(sPage)
{
  var winW = 1, winH = 1, screenW = 1, screenH = 1;

  try {
  if (parseInt(navigator.appVersion)>3)
  {
   if (navigator.appName=="Netscape")
   {
    winW = window.innerWidth;
    winH = window.innerHeight;
   }
   if (navigator.appName.indexOf("Microsoft")!=-1)
   {
    winW = document.body.offsetWidth;
    winH = document.body.offsetHeight;
   }
  }
  } catch(ex) {}

  try {
    if (parseInt(navigator.appVersion)>3) {
     screenW = screen.width;
     screenH = screen.height;
    }
    else if (navigator.appName == "Netscape"
        && parseInt(navigator.appVersion)==3
        && navigator.javaEnabled()
       )
    {
     var jToolkit = java.awt.Toolkit.getDefaultToolkit();
     var jScreenSize = jToolkit.getScreenSize();
     screenW = jScreenSize.width;
     screenH = jScreenSize.height;
    }
  } catch(ex) {}

   var str = "?from=" + sPage + "&winH=" + winH + "&winW=" + winW;
   try { str += "&screenH=" + screen.height      + "&screenW=" + screen.width;      } catch(ex) {}
   try { str += "&availH="  + screen.availHeight + "&availW="  + screen.availWidth; } catch(ex) {}

   (new Image(1,1)).src="http://www.parachuteschool.com/stub.gif" + str;
}