jquery - JavaScript not working when moved to an external .js file -

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i had working java script in html page.now moved script external js file. here script(jful.js)

<script type="text/javascript"> $(function() {      // grab initial top offset of navigation      var sticky_navigation_offset_top = $('#catnav').offset().top;      // our function decides weather navigation bar should have "fixed" css position or not.     var sticky_navigation = function(){         var scroll_top = $(window).scrolltop(); // our current vertical position top          // if we've scrolled more navigation, change position fixed stick top,         // otherwise change relative         if (scroll_top > sticky_navigation_offset_top) {              $('#catnav').css({ 'position': 'fixed', 'top':0, 'left':0 });         } else {             $('#catnav').css({ 'position': 'relative' });          }        };      // run our function on load     sticky_navigation();      // , run again every time scroll     $(window).scroll(function() {          sticky_navigation();     });  }); </script>

now script not working. included script 

<head><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> <script type="text/javascript"  src="jful.js"></script></head>

when again add script directly html document ,it works !(this script execute when scroll down page ) problem ??

remove these

<script type="text/javascript">

and 

</script>

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