/** 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/                           **/
function XHConn()
{
  var xmlhttp, bComplete = false;
  var params = false;
  var debug = 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, fnParams)
  {
    if (!xmlhttp) return false;
    bComplete = false;
    sMethod = sMethod.toUpperCase();
	params = fnParams;
	
	noticeWindow_ajax.showOverlay();
//	sMethod="GET";
    try {
      if (sMethod == "GET")
      {
		var s = sURL;
		if ( sVars != "" ) s += "?"+sVars;
		if ( debug ) console.log( 'xhc str:', s );
        xmlhttp.open(sMethod, s, true);
        sVars = "";
      }
      else
      {
        xmlhttp.open(sMethod, sURL, 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)
        {
	  if ( xmlhttp.status == 200 )
	  {
	          bComplete = true;
			  //console.log('fndone: ', fnDone, ' ', params );
			  noticeWindow_ajax.close();
	          fnDone(xmlhttp, params);
	  }
	  else
	  {
	  	showError( 'ajaxerror' );
	  }
      }};
//	  console.log('xh vars:',sVars);
		if ( debug ) console.log( 'xhc svars:', sVars );
      xmlhttp.send(sVars);
    }
    catch(z) { return false; }
    return true;
  };
  return this;
}