jQuery.easing.quart = function (x, t, b, c, d) {  
     return -c * ((t=t/d-1)*t*t*t - 1) + b;  
 };  
   
 /*------------------------------------- 
  ページ読み込み中 
 -------------------------------------*/  
 jQuery(document).ready(function(){  
   
    //  
     // <a href="#***">の場合、スクロール処理を追加  
     //  
     jQuery('#ontop').click(function() {  
         if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {  
          var $target = jQuery(this.hash);  
         $target = $target.length && $target || jQuery('[name=' + this.hash.slice(1) +']');  
            if ($target.length) {  
             var targetOffset = $target.offset().top;  
              jQuery('html,body').animate({ scrollTop: targetOffset }, 1200, 'quart');  
               return false;  
           }  
       }  
     });  
   
 });