JQuery - does not go to the selected tab after reloading the page

I have used the following to store the selected tab "index" to the document.cookie, the document.cookie stores the correct selected tab index. However,  $('#tabs').tabs('select', document.cookie); is not working, does not go to the selected tab index.

Below is my codes, please advise

<script type="text/javascript">
      $(document).ready(function() {
         // $('#tabs').tabs('select', $.cookie("tabNumber"));
       alert("document.cookie[" + document.cookie + "]");
         $('#tabs').tabs('select', document.cookie);   <== this one seems not to be corect

         $('#tabs').click(function() {
            var selected = $('#tabs').tabs('option', 'selected');
            document.cookie = selected;
           //$.cookie("myselectedtab", $tabs.tabs('option', 'selected'));
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Gurvinder Pal SinghCommented:

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unistudentAuthor Commented:
I know EE Administrator. I have done all my work myself and asked for some questions I dont understand. I have honestly told my lecturer about asking some advice from here. they all say ok. I am not asking for people giving me codes.
unistudentAuthor Commented:
Dont know why it does not work i have read and tried based on http://jqueryui.com/demos/tabs/#cookie. anyway, i use document.cookie instead. it works.
unistudentAuthor Commented:
Thank you for your advice. gurvinder372Posted
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