function insert_code(id,tag1,tag2) {
	 var input = document.getElementById(id);
	 input.focus();
	 if (typeof document.selection != 'undefined') {
	  var range = document.selection.createRange();
	  var insText = range.text;
	  range.text = tag1 + insText + tag2;
	  range = document.selection.createRange();
	  if (insText.length == 0) { range.move('character', -tag2.length); }
	  else { range.moveStart('character', tag1.length + insText.length + tag2.length); }
	  range.select();
	 }
	 else if (typeof input.selectionStart != 'undefined') {
	  var start = input.selectionStart;
	  var end = input.selectionEnd;
	  var insText = input.value.substring(start, end);
	  input.value = input.value.substr(0, start) + tag1 + insText + tag2 + input.value.substr(end);
	  var pos;
	  if (insText.length == 0) { pos = start + tag1.length; }
	  else { pos = start + tag1.length + insText.length + tag2.length; }
	  input.selectionStart = pos;
	  input.selectionEnd = pos;
	 }
	 else {
	  var pos;
	  var re = new RegExp('^[0-9]{0,3}$');
	  while (!re.test(pos)) { pos = prompt("Einfügen an Position (0.." + input.value.length + "):", "0"); }
	  if (pos > input.value.length) { pos = input.value.length; }
	  var insText = prompt("Bitte geben Sie den zu formatierenden Text ein:");
	  input.value = input.value.substr(0, pos) + tag1 + insText + tag2 + input.value.substr(pos);
	 }
	}