$('#menu').ready(
    function(){
        //centriranje stavki menija
        var _w = $('#nav').width();
        var _pad_l = parseInt($('#nav').css('padding-left'));
        var _pad_r = parseInt($('#nav').css('padding-right'));

        var _target_space = (980 - _w - _pad_l - _pad_r) / 2;

        $('#nav').css('margin-left',_target_space);
    }
);