function insertEditor(start, end, description)
{
  if (typeof(document.selection) != 'undefined')
  {
    if (document.selection.createRange().text.length > 0)
    {
      document.selection.createRange().text = start+document.selection.createRange().text+end;
      document.getElementById('textfield').focus();
    }
    else
    {
	  document.getElementById('helpArea').innerHTML = '- <span class="tekst">' + description + '</span>';
    }
  }
  else
  {
    if (document.getElementById('textfield').selectionStart == document.getElementById('textfield').selectionEnd)
	{
	  document.getElementById('helpArea').innerHTML = '- <span class="tekst">' + description + '</span>';
	}
	else
	{
	  var str = document.getElementById('textfield').value.substring(0, document.getElementById('textfield').selectionStart);
	  str += start + document.getElementById('textfield').value.substring(document.getElementById('textfield').selectionStart, document.getElementById('textfield').selectionEnd) + end;
	  str += document.getElementById('textfield').value.substring(document.getElementById('textfield').selectionEnd, document.getElementById('textfield').textLength);
	  document.getElementById('textfield').value = str;
	  document.getElementById('textfield').focus();
	}
	document.getElementById('textfield').focus();
  }
}