function insertt(openTag, closeTag) {
 var input = document.forms['edit'].elements['TEXT'];
 input.focus();
 
 if(typeof input.selectionStart != 'undefined'){
     var start = input.selectionStart;
     var end = input.selectionEnd;
     var scroll = input.scrollTop;
     var pos;
 
     var insText = input.value.substring(start, end);
     input.value = input.value.substr(0, start) + openTag + insText + closeTag + input.value.substr(end);
 
 
     if(insText.length == 0){
      pos = start + openTag.length;
     }else{
      pos = start + openTag.length + insText.length + closeTag.length;
     }
 
     input.selectionStart = pos;
     input.selectionEnd = pos;
     input.scrollTop = scroll;
  }
}

function truc(debut,fin)  
{
document.getElementById('id-message').value=document.getElementById('id-message').value+debut;
document.getElementById('id-message').value= document.getElementById('id-message').value+fin;
document.getElementById('id-message').focus();
}