Conflict b/w datepicker and autocomplete jquery

The below code works seperately in different php page. But when combining both in one page, nothing works. In firebug, the error says,

TypeError: $(...).datepicker is not a function

$("#test1").datepicker({

CODE FOR DATEPICKER

    <link rel="stylesheet" href="css/date_pick/jquery-ui.css">
    <script src="css/date_pick/jquery-1.10.2.js"></script>
    <script src="css/date_pick/jquery-ui.js"></script>
    <script type="text/javascript">

    $(document).ready(function(){
            $("#test1").datepicker({
            changeMonth:true,
         changeYear:true,
         yearRange:"-35:+0",
         dateFormat:"dd/mm/yy"
      });
      });

    </script>
<input type="text" name="test1" id="test1" />

CODE FOR AUTOCOMPLETE

 <link rel="stylesheet" href="lib/js/jquery.autocomplete.css">
    <!-- jQuery & JS files -->
<script src="bootstrap/js/jquery.js"></script>
    <script src="lib/js/jquery.autocomplete.js "></script>