function add_bbcode (textarea, bbcode) {
  var content = '';
  var info = '';
  if (bbcode == 'B') { 
      content = prompt(lang['ENTER_TEXT_BOLD']);
    if (content == null) {
	return;
    }
    textarea.value = textarea.value + '[B]' + content + '[/B]';
    return;
  }
  if (bbcode == 'I') {
    content = prompt(lang['ENTER_TEXT_ITALIC'], "");    
    if (content == null) {
        return;
    }
    textarea.value = textarea.value + '[I]' + content + '[/I]';
    return;
  }   
  if (bbcode == 'IMG') {
    content = prompt(lang['ENTER_URL_IMG'], "http://");    
    if (content == null) {
        return;
    }
    textarea.value = textarea.value + '[IMG]' + content + '[/IMG]';
    return;
  }    
  if (bbcode == 'URL') {
    var url = prompt(lang['ENTER_URL_LINK'], "http://");    
    if (url == null) {
        return;
    }
    var text = prompt(lang['ENTER_TEXT_LINK'], "");    
    if (text == null || text == "") {
      textarea.value = textarea.value + '[URL]' + url + '[/URL]';        
    }else{
      textarea.value = textarea.value + '[URL=' + url + ']' + text + '[/URL]';
    }
    return;
  }    
  if (bbcode == 'QUOTE') {
    textarea.value = textarea.value + '[QUOTE]' + content + '[/QUOTE]';
    return;
  }    
}