Zend FR

/**
 * Toolbar for text editor
 *
 * phpBBB and others sources...
 */


/**
 * Some browser detection
 */
var clientPC  = navigator.userAgent.toLowerCase(); // Get client info
var is_macos  = navigator.appVersion.indexOf('Mac') != -1;
var is_gecko  = ((clientPC.indexOf('gecko')!=-1) && (clientPC.indexOf('spoofer')==-1) &&
                (clientPC.indexOf('khtml') == -1) && (clientPC.indexOf('netscape/7.0')==-1));
var is_safari = ((clientPC.indexOf('AppleWebKit')!=-1) && (clientPC.indexOf('spoofer')==-1));
var is_khtml  = (navigator.vendor == 'KDE' || ( document.childNodes && !document.all && !navigator.taintEnabled ));
if (clientPC.indexOf('opera')!=-1) {
    var is_opera = true;
    var is_opera_preseven = (window.opera && !document.childNodes);
    var is_opera_seven = (window.opera && document.childNodes);
}


/**
 * Format selection
 *
 * Apply tagOpen/tagClose to selection in textarea, use sampleText instead
 * of selection if there is none. Copied and adapted from phpBB
 *
 * @author phpBB development team
 * @author MediaWiki development team
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Jim Raynor <jim_raynor@web.de>
 */
function insertTags(edid,tagOpen, tagClose, sampleText) {
  var txtarea = document.getElementById(edid);
  // IE
  if(document.selection  && !is_gecko) {
    var theSelection = document.selection.createRange().text;
    var replaced = true;
    if(!theSelection){
      replaced = false;
      theSelection=sampleText;
    }
    txtarea.focus();

    // This has change
    var text = theSelection;
    if(theSelection.charAt(theSelection.length - 1) == " "){// exclude ending space char, if any
      theSelection = theSelection.substring(0, theSelection.length - 1);
      r = document.selection.createRange();
      r.text = tagOpen + theSelection + tagClose + " ";
    } else {
      r = document.selection.createRange();
      r.text = tagOpen + theSelection + tagClose;
    }
    if(!replaced){
      r.moveStart('character',-text.length-tagClose.length);
      r.moveEnd('character',-tagClose.length);
    }
    r.select();
  // Mozilla
  } else if(txtarea.selectionStart || txtarea.selectionStart == '0') {
    replaced = false;
    var startPos = txtarea.selectionStart;
    var endPos   = txtarea.selectionEnd;
    if(endPos - startPos){ replaced = true; }
    var scrollTop=txtarea.scrollTop;
    var myText = (txtarea.value).substring(startPos, endPos);
    if(!myText) { myText=sampleText;}
    if(myText.charAt(myText.length - 1) == " "){ // exclude ending space char, if any
      subst = tagOpen + myText.substring(0, (myText.length - 1)) + tagClose + " ";
    } else {
      subst = tagOpen + myText + tagClose;
    }
    txtarea.value = txtarea.value.substring(0, startPos) + subst +
                    txtarea.value.substring(endPos, txtarea.value.length);
    txtarea.focus();

    //set new selection
    if(replaced){
      var cPos=startPos+(tagOpen.length+myText.length+tagClose.length);
      txtarea.selectionStart=cPos;
      txtarea.selectionEnd=cPos;
    }else{
      txtarea.selectionStart=startPos+tagOpen.length;
      txtarea.selectionEnd=startPos+tagOpen.length+myText.length;
    }
    txtarea.scrollTop=scrollTop;
  // All others
  } else {
    var copy_alertText=alertText;
    var re1=new RegExp("\\$1","g");
    var re2=new RegExp("\\$2","g");
    copy_alertText=copy_alertText.replace(re1,sampleText);
    copy_alertText=copy_alertText.replace(re2,tagOpen+sampleText+tagClose);

    if (sampleText) {
      text=prompt(copy_alertText);
    } else {
      text="";
    }
    if(!text) { text=sampleText;}
    text=tagOpen+text+tagClose;
    //append to the end
    txtarea.value += "\n"+text;

    // in Safari this causes scrolling
    if(!is_safari) {
      txtarea.focus();
    }

  }
  // reposition cursor if possible
  if (txtarea.createTextRange){
    txtarea.caretPos = document.selection.createRange().duplicate();
  }
}


/*
 * Insert the given value at the current cursor position
 *
 * @see http://www.alexking.org/index.php?content=software/javascript/content.php
 */
function insertAtCarret(edid, value){
    
  var oField = document.getElementById(edid);

  // For Internet Explorer
  
  if (document.selection) {
    oField.focus();
    sel = document.selection.createRange();
    sel.text = value;
  }

  // For Mozilla / Netscape
  
  else if (oField.selectionStart || oField.selectionStart == '0') {
    
    var startPos  = oField.selectionStart;
    var endPos    = oField.selectionEnd;
    var scrollTop = oField.scrollTop;
    oField.value  = oField.value.substring(0, startPos) + value + oField.value.substring(endPos, oField.value.length);

    oField.focus();
    var cPos=startPos+(value.length);
    oField.selectionStart=cPos;
    oField.selectionEnd=cPos;
    oField.scrollTop=scrollTop;
    
  }
  
  else {
    oField.value += "\n" + value;
  }
  
  // If possible, reposition cursor
  if (oField.createTextRange){
      
    oField.caretPos = document.selection.createRange().duplicate();
    
  }
  
  return;
  
}

<a href="#" onclick="insertTags('message', '[b]', '[/b]', 'Texte en gras')"><img src="..." /></a>