function createRequest() {
  var xmlHttp = false;
  // Mozilla, Opera, Safari sowie Internet Explorer 7
  if (typeof XMLHttpRequest != 'undefined') {
    xmlHttp = new XMLHttpRequest();
  }
  if (!xmlHttp) {
    // Internet Explorer 6 und älter
    try {
      xmlHttp  = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
      try {
        xmlHttp  = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e) {
        xmlHttp = false;
      }
    }
  }
  return xmlHttp;
}

function postcss(message, sessionID) {
  var client = createRequest();
  client.open("GET",
              "/all/changecss.jsp;jsessionid=" + sessionID + "?" + message);
  client.send("");
}

function changecss(css, sessionID) {
  if (document.styleSheets) {
    var sheets = document.styleSheets;
    // alert("gewünscht: "+ css + ".css\naktuell: "+ sheets[0].href);
    var csslink = document.getElementById("css-link5");
    var aA1 = document.getElementById("aA1");
    var aA2 = document.getElementById("aA2");
    // Obacht: "1" ist: antolin.logik.Base.DEFAULT_PREFERRED_CSS
    if (css == "1") {
      csslink.href = "/css/fontsize.css";
      aA1.style.display = 'block';
      aA2.style.display = 'none';
    } else { 
      csslink.href = "/css/fontsize_big.css";
      aA1.style.display = 'none';
      aA2.style.display = 'block';
    }
    postcss("newcss=" + css, sessionID);
  }
}