/**
 * getURL is a proprietary Adobe function, but it's simplicity has made it very
 * popular. If getURL is undefined we spin our own by wrapping XMLHttpRequest.
 */
if (typeof getURL == 'undefined') {
  getURL = function(url, callback) {
    if (!url)
      throw 'No URL for getURL';

    try {
      if (typeof callback.operationComplete == 'function')
        callback = callback.operationComplete;
    } catch (e) {}
    if (typeof callback != 'function')
      throw 'No callback function for getURL "' + url + '"';

    var http_request = null;
    if (typeof XMLHttpRequest != 'undefined') {
      http_request = new XMLHttpRequest();
    }
    else if (typeof ActiveXObject != 'undefined') {
      try {
        http_request = new ActiveXObject('Msxml2.XMLHTTP');
      } catch (e) {
        try {
          http_request = new ActiveXObject('Microsoft.XMLHTTP');
        } catch (e) {}
      }
    }
    if (!http_request)
      throw '<?=gettext("Both getURL and XMLHttpRequest are undefined"); ?>';

    http_request.onreadystatechange = function() {
      if (http_request.readyState == 4) {
        callback( { success : true,
                    content : http_request.responseText,
                    contentType : http_request.getResponseHeader("Content-Type") } );
      }
    }
    http_request.open('GET', url, true);
    http_request.send(null);
  }
}