var timerid;
    var istimerset = false;
    var firstTime = false;
    var orig = '';
    
    function swapinhoud(v,n) {
      if (orig!='') {
        document.getElementById(orig).innerHTML = document.getElementById('receptuitleg').innerHTML;
      }
      document.getElementById(n).innerHTML = document.getElementById(v).innerHTML;
      document.getElementById(v).innerHTML = '';
      orig=v;
    }
    
    function loadrecept(nr) {
      if (firstTime) {
        cancelrecept0();
        swapinhoud('recept'+nr,'receptuitleg');
      }
    }
    
    function cancelrecept0() {
      if (istimerset) {
        clearTimeout(timerid);
        istimerset = false;
      }
    }
    
    function loadrecept0() {
      cancelrecept0();
      istimerset = true;
      timerid = setTimeout('recept0timeout()',2000)
    }
    
    function recept0timeout() {
      cancelrecept0();
      istimerset = false;
      swapinhoud('recept0','receptuitleg');
      firstTime = true;
    }