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console.log();
var itemPositions = [];
var currentPosition = 0;
var itemsWidth = 0;
var widthOfList = function () {

    itemPositions = []; //just in case we need to reset it
    var marginWidth = 28;
    var wrapperWidth = $('.maintabs-wrapper').innerWidth() - marginWidth;
    itemPositions.push(0); //left most positions

    $('.maintabs-wrapper .nav-tabs li').each(function () {

        var itemWidth = $(this).outerWidth(true);
        itemsWidth += itemWidth;

        if (itemsWidth > wrapperWidth) {

            itemPositions.push(itemsWidth - wrapperWidth); //push in the left offset to move to the right (or left)
        }

    });
};

//used to check whether to show either arrow
var reAdjust = function () {

    if (($('.maintabs-wrapper').outerWidth()) < itemsWidth) {
        //$('.scroller-right').show();
    } else {
        //$('.scroller-right').hide();
    }

    if (getLeftPosi() < 0) {
        //$('.scroller-left').show();
    }

};

var moveRight = function () {
    if (currentPosition + 1 < itemPositions.length) {
        $('.maintabs-wrapper .nav-tabs').animate({
            left: "-" + itemPositions[++currentPosition] + "px"
        }, 'fast', reAdjust);
    }

}

var moveLeft = function () {
    if (currentPosition - 1 >= 0) {
        $('.maintabs-wrapper .nav-tabs').animate({
            left: "-" + itemPositions[--currentPosition] + "px"
        }, 'fast', reAdjust);
    }

}

//gets the current left scroll position of the list
var getLeftPosi = function () {
    return $('.maintabs-wrapper .nav-tabs').position().left;
};

function initTabs(){
    widthOfList();
    $('#_tab_scroller_btn_right').click(function () {

        //widthOfList();
        moveRight();

    });

    $('#_tab_scroller_btn_left').click(function () {

        //widthOfList();
        moveLeft();

    });
}