// initialise plugins for navigation
   $(document).ready(function(){ 
       $("ul.sf-menu").supersubs({ 
           minWidth:    15.9,   // minimum width of sub-menus in em units 
           maxWidth:    15.9,   // maximum width of sub-menus in em units 
           extraWidth:  1     // extra width can ensure lines don't sometimes turn over 
                              // due to slight rounding differences and font-family 
       }).superfish();  // call supersubs first, then superfish, so that subs are 
                        // not display:none when measuring. Call before initialising 
                        // containing tabs for same reason. 
   });