JS file Format check

&LT;HTML&GT;&NBSP;&NBSP;&NBSP;&LT;HEAD&GT;&NBSP;&NBSP;&NBSP;&LT;TITLE&GT;JS Checksum file Format </title>    <meta http-equiv= ' Content-type '  content= ' text/html;charset=utf-8 ' >   < Script type= "Text/javascript"  src= "Jquery-1.4.3.js" ></script>   <script  type= "Text/javascript" >       function get () {       var s = $ ("#file1"). Val ();      var  Fl = s.split (".");    //commonly used file formats       var ary = ["Doc", "docx", "xls", " Xlsx "," ppt "," gif "," JPEG "," JPG "," png "," TXT "," WPS "," PDF "];          The    //file format returns the subscript in the array, otherwise returns  -1     var t= $.inarray (Fl[1], ary);          return t==-1;        }      </script>  
 JS file format check