$(function() {  
  $('a[href*=#]').click(function() {  
    if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')  
      && location.hostname == this.hostname) {  
      var $target = $(this.hash);  
      $target = $target.length && $target  
        || $('[name=' + this.hash.slice(1) +']');  
      if ($target.length) {  
        var targetOffset = $target.offset().top - 20;  
        $('html,body')  
          .animate({scrollTop: targetOffset}, 1000);  
        return false;  
      }  
    }  
  });  
});