function insertion(repdeb, repfin, form, element) {
  var input = document.forms[form].elements[element];
  input.focus();
  /* pour l'Explorer Internet */
  if(typeof document.selection != 'undefined') {
    /* Insertion du code de formatage */
    var range = document.selection.createRange();
    var insText = range.text;
    range.text = repdeb + insText + repfin;
    /* Ajustement de la position du curseur */
    range = document.selection.createRange();
    if (insText.length == 0) {
      range.move('character', -repfin.length);
    } else {
      range.moveStart('character', repdeb.length + insText.length + repfin.length);
    }
    range.select();
  }
  /* pour navigateurs plus récents basés sur Gecko*/
  else if(typeof input.selectionStart != 'undefined')
  {
    /* Insertion du code de formatage */
    var start = input.selectionStart;
    var end = input.selectionEnd;
    var insText = input.value.substring(start, end);
    input.value = input.value.substr(0, start) + repdeb + insText + repfin + input.value.substr(end);
    /* Ajustement de la position du curseur */
    var pos;
    if (insText.length == 0) {
      pos = start + repdeb.length;
    } else {
      pos = start + repdeb.length + insText.length + repfin.length;
    }
    input.selectionStart = pos;
    input.selectionEnd = pos;
  }
  /* pour les autres navigateurs */
  else
  {
    /* requête de la position d'insertion */
    var pos;
    var re = new RegExp('^[0-9]{0,3}$');
    while(!re.test(pos)) {
      pos = prompt("Insertion à la position (0.." + input.value.length + "):", "0");
    }
    if(pos > input.value.length) {
      pos = input.value.length;
    }
    /* Insertion du code de formatage */
    var insText = prompt("Veuillez entrer le texte à formater:");
    input.value = input.value.substr(0, pos) + repdeb + insText + repfin + input.value.substr(pos);
  }
}

function insert_text(open, close, form, element)
	{
		msgfield = document.forms[form].elements[element];

		// IE support
		if (document.selection && document.selection.createRange)
		{
			msgfield.focus();
			sel = document.selection.createRange();
			sel.text = open + sel.text + close;
			msgfield.focus();
		}

		// Moz support
		else if (msgfield.selectionStart || msgfield.selectionStart == '0')
		{
			var startPos = msgfield.selectionStart;
			var endPos = msgfield.selectionEnd;

			msgfield.value = msgfield.value.substring(0, startPos) + open + msgfield.value.substring(startPos, endPos) + close + msgfield.value.substring(endPos, msgfield.value.length);
			msgfield.selectionStart = msgfield.selectionEnd = endPos + open.length + close.length;
			msgfield.focus();
		}

		// Fallback support for other browsers
		else
		{
			msgfield.value += open + close;
			msgfield.focus();
		}

		return;
	}