function merkzettel_del() {
  var xmlhttp;
  if (window.XMLHttpRequest) {
    // code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    // code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  } else {
    alert("Your browser does not support XMLHTTP!");
  }
  
  xmlhttp.onreadystatechange=function() {
    if(xmlhttp.readyState==4) {
      merkzettel('','');
    }
  }
  
  xmlhttp.open("GET","scripts/merkzettel.php?del=yes",true);
  xmlhttp.send("ie='suck'");
}
function merkzettel(varname,varval) {
  var xmlhttp;
  if (window.XMLHttpRequest) {
    // code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    // code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  } else {
    alert("Your browser does not support XMLHTTP!");
  }
  
  xmlhttp.onreadystatechange=function() {
    if(xmlhttp.readyState==4) {
      document.getElementById('merkzettel').innerHTML=xmlhttp.responseText;
    }
  }
  
  xmlhttp.open("GET","scripts/merkzettel.php?varname="+varname+"&varval="+varval,true);
  xmlhttp.send("ie='suck'");
}