var maxHeight = 150;

$(function(){

    $(".netbookmenu-contenu-container").hover(function() {
    
         var $container = $(this),
             $list = $container.find("div"),
             height = $list.height() * 1.05,
             multiplier = height / maxHeight;

         if (multiplier > 1) {
            $container
                .mousemove(function(e) {
                    var offset = $container.offset();
                    var relativeY = ((e.pageY - offset.top) * multiplier);
                    if (relativeY > 0) {
                        $list.css("top", -relativeY);
                    }
		    else {
		    	$list.css("top", 0);
		    }
                });
        }
        
    });
    
});