function swapOn( btnno ) {

   if ( document.images ) {
      document["btn" + btnno].src = "images/btn" + btnno + "on.jpg";
   }

}

function swapOff( btnno ) {

   if ( document.images ) {
      document["btn" + btnno].src = "images/btn" + btnno + "off.jpg";
   }

}

function swapOnAdmin( btnno ) {

   if ( document.images ) {
      document["btn" + btnno].src = "../images/btn" + btnno + "on.jpg";
   }

}

function swapOffAdmin( btnno ) {

   if ( document.images ) {
      document["btn" + btnno].src = "../images/btn" + btnno + "off.jpg";
   }

}

function getArgs() {

   // Returns an array of URL encoded parameters passed to an HTML page
   var args = new Object();
   var query = location.search.substring(1);     // Get query string.
   var pairs = query.split(",");                 // Break at comma.
   for (var i = 0; i < pairs.length; i++) {
      var pos = pairs[i].indexOf('=');           // Look for "name=value".
      if (pos == -1) continue;                   // If not found, skip.
      var argname = pairs[i].substring(0,pos);   // Extract the name.
      var value = pairs[i].substring(pos+1);     // Extract the value.
      args[argname] = unescape(value);           // Store as a property.
   }
   return args;                                  // Return the object.

}