var api = $("#scrollable").scrollable({size:1, vertical:false, speed:300, loop:true, easing:"linear", api: true, navi: ".navi", naviItem: "span"});
width = api.getPageAmount()*16;
var num = 390 - width/2;
$(".navi").css("margin-left", num);
$(".navi").css("width", width+4);

$(".navi").css("visibility", "visible");