/** XHConn - Simple XMLHTTP Interface - bfults@gmail.com - 2005-04-08        **
 ** Code licensed under Creative Commons Attribution-ShareAlike License      **
 ** http://creativecommons.org/licenses/by-sa/2.0/                           **/
/**
* Modified slightly from original to support synchoronous transactions
* CDB 2007-05-16, 2007-06-05
*/
 
function XHConn()
{
  var xmlhttp, bComplete = false;
  try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); }
  catch (e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }
  catch (e) { try { xmlhttp = new XMLHttpRequest(); }
  catch (e) { xmlhttp = false; }}}
  if (!xmlhttp) return null;
  this.connect = function(sURL, sMethod, sVars, fnDone, bAsynch)
  {
    if (!xmlhttp) return false;
      bComplete = false;
      sMethod = sMethod.toUpperCase();

      if (bAsynch == null) bAsynch = true; //treat asynch as an optional argument

      try {
	if (sMethod == "GET")
	{
	  xmlhttp.open(sMethod, sURL+"?"+sVars, (bAsynch == true));
	  sVars = "";
	}
	else
	{
	  xmlhttp.open(sMethod, sURL, (bAsynch == true));
	  xmlhttp.setRequestHeader("Method", "POST "+sURL+" HTTP/1.1");
	  xmlhttp.setRequestHeader("Content-Type",
	  "application/x-www-form-urlencoded");
	}

	xmlhttp.onreadystatechange = function(){
	  if (xmlhttp.readyState == 4 && !bComplete)
	  {
	    bComplete = true;
	    fnDone(xmlhttp);
	  }
	};
	xmlhttp.send(sVars);

	/**
	 * Firefox <= 2.0.0 doesn't fire onreadystatechange for synchronous requests.
	 * See http://lukav.com/wordpress/2007/04/12/firefox-firebug-and-synchronos-calls-problem/
	 */

	var isGecko = (document.addEventListener) ? true : false;
	try {
	  if (!bAsynch && isGecko && xmlhttp.onreadystatechange == null) {
	    bComplete = true;
	    fnDone(xmlhttp);
	    return true;
	  }
	}
	catch (e) { return false; }
	/**
	 * End synchronous request patch
	 */
      }
      catch(z) { return false; }
      return true;
  };
  return this;
}