var BBCODES = {
	'b' : {'open':'[b]', 'close':'[/b]'},
	'i' : {'open':'[i]', 'close':'[/i]'},
	'u' : {'open':'[u]', 'close':'[/u]'},
	'link' : {'open':'[link]', 'close':'[/link]'}
}

var addBBCode = function(_code,_field) {
	if(BBCODES[_code] != undefined) {
		var bbcode = BBCODES[_code]['open'] + BBCODES[_code]['close'];
/*      if()
		var oldText = $('#'+_field).val();
		var newText =
      var sl = (txtarea.value).substring(txtarea.selectionStart,
txtarea.selectionEnd);*/
		$('#'+_field).val($('#'+_field).val()+bbcode);
	}
}