Edit in place improve code

Edit in place improve code

This is an edit in place script anyone can help me to improve it?
If I update two time the same comment i have a problem.

$(document).ready(function(){
$(".comment").each(function(i){
setClickable(this);
})

});

function setClickable(obj) {
  $("#edit_"+$(obj).attr('id')).click(function()  {
  var textarea = '<textarea rows="4" cols="60" name="'+$(obj).attr('id')+'">'+$(obj).html()+'</textarea>';
  $("#edit_settings_"+$(obj).attr('id')).hide();
  $("#save_settings_"+$(obj).attr('id')).show();
  var revert = $(obj).html();
  $(obj).html(textarea);
  $("#save_"+$(obj).attr('id')).click(function(){saveChanges($(obj),$(obj).attr('id'),revert);});
  // alert ($(obj).attr('id'));

   })

}

function saveChanges(obj, n, revert) {
  var val = $('textarea[name="'+n+'"]').val();
  if(val=='') val=revert;
  //alert (val);
  $(obj).html(val);
  $("#edit_settings_"+n).show();
  $("#save_settings_"+n).hide();
  $.post("test.php",{
  content: val,
  n: n
},function(txt){
alert( txt);
});

}



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>
  <title>Hello!</title>
  <link rel="stylesheet" href="css.css" type="text/css" />
  <script src="jquery.js" type="text/javascript"></script>
  <script src="jreplacev.js" type="text/javascript"></script>

</head>

<body>

      <div id="123" class="comment">Edit the article body text here...</div>

   <div id="edit_settings_123">
      <input id="edit_123" name="edit" value="edit" type="button">
   </div>

   <div id="save_settings_123" style="display: none;">
      <input id="save_123" name="save" value="save" type="button">
   </div>


    <div id="456" class="comment">Edit the article body text here...</div>

   <div id="edit_settings_456">
      <input id="edit_456" name="edit" value="edit" type="button">
   </div>

   <div id="save_settings_456" style="display: none;">
      <input id="save_456" name="save" value="save" type="button">
   </div>
    <div id="789" class="comment">Edit the article body text here...</div>

   <div id="edit_settings_789">
      <input id="edit_789" name="edit" value="edit" type="button">
   </div>

   <div id="save_settings_789" style="display: none;">
      <input id="save_789" name="save" value="save" type="button">
   </div>

</body>

</html>