Rails - Apr 2009 - Error "ActionController::InvalidAuthenticityToken"

Hi,
I am using rails 2.2
I an getting this error.
"ActionController::InvalidAuthenticityToken"

I have an code in my erb file is like this:

<div style="float:left;border:1px solid
red;width:200px;height:250px;">

    <div id="pdf_title" style="display:none">
      Title: <%=text_field(:page, :title, :size => 20)%>
      <a href="#"
onclick="add_title();">Create</a>
    </div>
  <script>
  function page_title(){
    $(''pdf_title'').style.display=''block'';
  }
  function add_title(){
    var pdf_title=$(''page_title'').value;
    //alert(pdf_title);
    var url="face/add_title"
    new Ajax.Updater('''', url, {asynchronous:true,
evalScripts:true,onComplete:function(request){reset_div();},parameters:{page_title:
pdf_title }});
  }

</script>

Whenever I am clicking onto the Create link I am getting error.
"ActionController::InvalidAuthenticityToken"
Could any one please help me out urgently.
I am new in rails 2.0 and above
Thanks,
Tushar
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