two different autocomplete on the same page

two different autocomplete on the same page

hi everyone i'm new in this.
i wanted to use two autocomplete textbox on my page
the first one firesup but the second one doesn't work!
this is my code, what i'm doing wrong?

    <script>         
         $(function() {
            var availableTags = [ <%=ac_data%>];
            $( "#auditor" ).autocomplete({
          source: availableTags
        });
      });  
    </script>
        <script>         
         $(function() {
            var availablePres = [ <%=ac_prestador%>];
            $( "#prestador" ).autocomplete({
          source: availablePres
        });
      });  
    </script>


<!-- this are de boxes -->
<input id="prestadora" />
<input id="prestador" />