var http_request = false;

function macheRequest(url) {

    http_request = false;

    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/xml; charset=ISO-8859-1');
            // zu dieser Zeile siehe weiter unten
        }
    } else if (window.ActiveXObject) { // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }

    if (!http_request) {
        alert('Ende :( Kann keine XMLHTTP-Instanz erzeugen');
        return false;
    }
    http_request.onreadystatechange = alertInhalt;
    http_request.open('GET', url, true);
    http_request.send(null);

}

function alertInhalt() {

    if (http_request.readyState == 4) {
        if (http_request.status == 200) {
            //alert(http_request.responseText);
            document.getElementById(respID).value = http_request.responseText;
        } else {
            alert('Bei dem Request ist ein Problem aufgetreten.');
        }
    }

}

function ktoinhab(opt)
{
  if(document.getElementById(opt + '_name').value != '' &&
     document.getElementById(opt + '_vorname').value != '' &&
     document.getElementById(opt + '_ktoinhab').value == '')
  {
    document.getElementById(opt + '_ktoinhab').value = document.getElementById(opt + '_vorname').value + ' ' + document.getElementById(opt + '_name').value;
  }
}

function einzug(opt)
{
  if(document.getElementById(opt + '_einzug').checked == true)
  {
    document.getElementById(opt + '_blz').disabled = false;
    document.getElementById(opt + '_bank').disabled = false;
    document.getElementById(opt + '_ktoinhab').disabled = false;
    document.getElementById(opt + '_ktonr').disabled = false;
  }
  else
  {
    document.getElementById(opt + '_blz').disabled = true;
    document.getElementById(opt + '_bank').disabled = true;
    document.getElementById(opt + '_ktoinhab').disabled = true;
    document.getElementById(opt + '_ktonr').disabled = true;
  }
}