code: function ServerVar($varName) {
          global $HTTP_SERVER_VARS;
          global $HTTP_ENV_VARS;
  
          if(!isset($_SERVER))
          {
              $_SERVER = $HTTP_SERVER_VARS;
              if(!isset($_SERVER["REMOTE_ADDR"]))
                  $_SERVER = $HTTP_ENV_VARS; // must be Apache
          }
          
          if(isset($_SERVER[$varName]))
              return $_SERVER[$varName];
          else
              return "";
      }
docs: Returns the appropriate server variable.  Should work with both
  PHP 4.1.0+ as well as older versions.  Returns an empty string
  if nothing is found.
  @access private
  @return mixed