var movedownvar = objheight = moveupvar = 0;
      var speed = 4;

      $(document).ready(function()
      {

       // Rileva la dimensione massima del box
          objheight = $(".scroll_testo").height();

       // Faccio scomparire il navigatore
         if(objheight < parseInt($("#scroll_container").height()))
         {
            $("a.down").hide();  $("a.up").hide();
         }

         $("a.down").hover(function(){       // Caso Over Down
            movedown()
         },function(){
            clearTimeout(movedownvar);
         });

         $("a.up").hover(function(){        // Caso Over Up
            moveup()
         },function(){
            clearTimeout(moveupvar);
         });

      });

      function movedown()
      {
        s_pos = parseInt($(".scroll_testo").css("top"));

       if (s_pos >=(objheight*(-1)+100))
            $(".scroll_testo").css('top', s_pos -= speed);

        movedownvar=setTimeout("movedown()",50);
      }

      function moveup()      
      {
        s_pos = parseInt($(".scroll_testo").css("top"));

        if (s_pos<=0)
            $(".scroll_testo").css('top', s_pos += speed);

 moveupvar=setTimeout("moveup()",50);
      }