jquery - $.widget is not a function -

i want make use of dragable elements.. load page this

$.widget not function 

the code

<script src="js/jquery/jquery-1.6.js" type="text/javascript"></script>  <script src="js/jquery/jquery.ui.core.js" type="text/javascript"></script> <script src="js/jquery/jquery.ui.draggable.js" type="text/javascript"></script> <script src="js/jquery/jquery.ui.mouse.js" type="text/javascript"></script> <script src="js/jquery/jquery.ui.widget.js" type="text/javascript"></script> 

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