How can I create a class for datepicker script?

How can I create a class for datepicker script?

I am not a coder and am new to jquery.  I am using a datepicker script and I need it to appear in more than one place on the page.  I asked in another forum but only got as far as the advice to "create a class" before his patience ran out.  I am not sure if he meant a css class or something within the js file.   Any help would be GREATLY appreciated.  :)  This is the script I have in the head tag:

  <link rel="stylesheet" href="jquery-ui-datepicker.css">
  <script src="jquery-1.10.2-datepicker.js"></script>
  <script src="jquery-ui-datepicker.js"></script>
  <script>
  $(function() {
    $( "#datepicker" ).datepicker();
  });
  </script>