[рони]

New2017,

jQuery(document).ready(function($) {
    var items = $("section.strip-item").hover(function() {
            show(items.index(this))
        }, function() {
            show(0)
        }),
        base_width = $(".strip-menu").attr("data-width"),
        count = $(".strip-menu").attr("data-count");

    function show(index) {
        items.css("width", (100 - base_width * 2) / (count - 1) + "%")
        .removeClass("hovered")
        .eq(index).css("width", base_width * 2 + "%")
        .addClass("hovered")
    }
    show(0)
});