if (!document.getElementById || navigator.userAgent.indexOf('Opera') != -1)
{
  // assign error handler for downlevel browsers
  // Note until Opera improves it's overall support
  // for JavaScript and the DOM, it must be considered downlevel

  window.onerror = defaultOnError;
  
  function defaultOnError(msg, url, line)
  {
    // handle bug in NS6.1, N6.2
    // where an Event is passed to error handlers
    if (typeof(msg) != 'string')
    {
        msg = 'unknown error';
    }
    if (typeof(url) != 'string')
    {
        url = document.location;
    }

    // customize this for your site
    if (top.location.href.indexOf(xblibrary.path + '/errors/') == -1)
      top.location = xblibrary.path + '/errors/index.html?msg=' + escape(msg) + '&url=' + escape(url) + '&line=' + escape(line);
  }
}

function xbLibrary(path)
{
  if (path.charAt(path.length-1) == '/')
  {
    path = path.substr(0, path.length-1)
  }
  this.path = path;
}

// dynamically loaded scripts
//
// it is an error to reference anything from the dynamically loaded file inside the
// same script block.  This means that a file can not check its dependencies and
// load the files for it's own use.  someone else must do this.  
  
xbLibrary.prototype.loadScript = 
function (scriptName)
{
  document.write('<script language="javascript" src="' + this.path + '/' + scriptName + '"><\/script>');
};