function addOption(text,value,box) {
	if(text) {
    var opt = new Option(text,value);
    var count = box.options.length;
    box.options[count] = opt;
  } else {
    alert("Du skal skrive en optiontekst, for at kunne tilføje");
  }
}

function removeOption(box) {
  try {
    if(box.options[box.selectedIndex])
      box.options[box.selectedIndex] = null;
    else
      alert("Du skal vælge en option, for at kunne fjerne den");
  } catch (e) {
      //exception thrown when user has not selected an option
      alert("Du skal vælge en option, for at kunne fjerne den");
    }
  }

function showOption(box) {
  try {
      var out = "Option text = ";
      out += box.options[box.selectedIndex].text;
      out += "\n";
      out += "Option value = ";
      out += box.options[box.selectedIndex].value;
      alert(out);
  } catch(e) {
      //exception thrown when user has not selected an option
      alert("Du skal vælge en option, for at kunne få dens værdi vist");
    }
  }