//
//  Globale Variablen
//



//
//  Erzeugt ein neues XML-HTTP-Request-Object (je nach Browser) und gibt es zurueck
//
function newXMLHttpRequest()
{
    var xmlreq = false;

    if(window.XMLHttpRequest)
    {
        xmlreq = new XMLHttpRequest();
    } else
    if(window.ActiveXObject)
    {
        try
        {
            xmlreq = new ActiveXObject("Msxml2.XMLHTTP");

        } catch(e1)
        {
            try
            {
                xmlreq = new ActiveXObject("Microsoft.XMLHTTP");

            } catch(e2)
            {
            }
        }
    }

    return xmlreq;
}



//
//  Behandelt die Rueckgabe des XML-HTTP-Requests entsprechend des HTTP-Error-Codes
//
function getReadyStateHandler ( req, responseXmlHandler, target, reqAction )
{
      return function()
      {
	    if(req.readyState == 4)
	    {
		if(req.status == 200)
		{
		    // req.responseText contains response in plain text
		    // req.responseXml contains XML or parsed DOM tree, RTFM!

		      //responseXmlHandler(target, req.responseText);
		      if ( target != null ) responseXmlHandler( target, req.responseText, reqAction );

		}
		else if( req.status == 403 )
		{
			      // http status 403, do something about that..
		}

	    }
      }
}


//
//  Schreibt den Inhalt content in das HTML-Element target
//
function update ( target, content, actionName )
{
      if ( target.tWin )
      {
	    target.setContent( content );
	    target.populate();
      }
      else
      {
	    var elem = document.getElementById(target);
	    if( elem ) elem.innerHTML = content;
      }

      if ( self.updateReport ) updateReport( actionName );
} 


//
//  Fuehrt eine serverseitige Funktion aus
//
function action( name, target, get_params, post_params )
{
      send( name, target, get_params, post_params );
}

function raction( name, target, param )
{
      req = send( name, null, param );

      error_code = parseInt( req.responseText );
alert( error_code );
      return error_code;
}


//
//  Sendet einen XMLHTTPRequest an action.php ab, und schreibt die Rueckgabe
//  in das HTML-Element mit der ID target
//
function send( reqAction, target, getParams, postParams )
{
      if ( target == undefined ) target = activeId;

      var req = newXMLHttpRequest();
      var handlerFunction = getReadyStateHandler(req, update, target, reqAction);
      var reqUrl = "action.php?action=" + reqAction;
      if ( getParams != undefined ) reqUrl += '&' + getParams;
      if ( postParams == undefined ) var postParams = '';
      //var params = encodeURI( param1 );
      //params += encodeURI("&param1=" + param1);

      req.onreadystatechange = handlerFunction;
      req.open( "POST", reqUrl, true );
      req.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded; charset=utf-8" );
      req.send( postParams );

//       http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
//       http_request.setRequestHeader("Content-length", parameters.length);
//       http_request.setRequestHeader("Connection", "close");
//       http_request.send(parameters);

      return req;
}


//
//  Laedt eine JavaScript-Datei in den DOM-Baum nach
//
function loadScript( url, scrptId )
{
      if ( scriptId == undefined ) var scriptId = url.replace( /[\/\.]/g, '' );

      if ( document.getElementById( scriptId ) ) return;
/*    eval("var old = document.getElementById('"+scriptId+"')");
      if ( old != null )
      {
	    old.parentNode.removeChild( old );
	    delete old;
      }*/

      var script = document.createElement( "script" );
      script.src = url;
      script.type="text/javascript";
      script.id = scriptId;
      document.getElementsByTagName("head")[0].appendChild( script );
}


//
//  Laedt einen CSS-Style-Sheet in den DOM-Baum nach
//
function loadCSS( url, sheetId )
{
      if ( sheetId == undefined ) var sheetId = url.replace( /[\/\.]/g, '' );
      if ( document.getElementById( sheetId ) ) return;

      var sheet = document.createElement( "link" );
      sheet.rel="stylesheet";
      sheet.href = url;
      sheet.id = sheetId;
      document.getElementsByTagName("head")[0].appendChild( sheet );
}


//
//  Encodiert param zur Uebertragung per AJAX-POST-Request
//
function formPost( pform )
{
      if ( document.getElementsByName(pform)[0] ) pform = document.getElementsByName(pform)[0];
      else if ( document.getElementById(pform) ) pform = document.getElementById(pform);

      var post_string = '';

      for ( i = 0; i < pform.elements.length; i++ )
      {
	    var elem = pform.elements[i];
	    if ( elem.type == 'text' || elem.type == 'hidden' || elem.type == 'textarea' || elem.type == 'password' )
	    {
		  post_string += elem.name + '=' + escape( encodeURI( elem.value ) );
	    }
	    else if ( ( elem.type == 'radio' || elem.type == 'checkbox' ) && elem.checked == true )
	    {
		  post_string += elem.name + '=' + escape( encodeURI( elem.value ) );
	    }
// 	    else if ( elem.type == 'checkbox' )
// 	    {
// 
// 	    }

	    if ( i < pform.elements.length ) post_string += '&';
      }

      return post_string;
}