$(document).ready(function() {
    $("#ext1").click(function() {
        $("#exc1").slideDown();
        $("#exc2").slideUp();
        $("#exc3").slideUp();
        $("#exa1").removeClass("expand-tab-arrow-down").addClass("expand-tab-arrow-up");
        $("#exa2").removeClass("expand-tab-arrow-up").addClass("expand-tab-arrow-down");
        $("#exa3").removeClass("expand-tab-arrow-up").addClass("expand-tab-arrow-down");
    });
    $("#ext2").click(function() {
        $("#exc2").slideDown();
        $("#exc1").slideUp();
        $("#exc3").slideUp();
        $("#exa2").removeClass("expand-tab-arrow-down").addClass("expand-tab-arrow-up");
        $("#exa1").removeClass("expand-tab-arrow-up").addClass("expand-tab-arrow-down");
        $("#exa3").removeClass("expand-tab-arrow-up").addClass("expand-tab-arrow-down");
    });
    $("#ext3").click(function() {
        $("#exc3").slideDown();
        $("#exc2").slideUp();
        $("#exc1").slideUp();
        $("#exa3").removeClass("expand-tab-arrow-down").addClass("expand-tab-arrow-up");
        $("#exa2").removeClass("expand-tab-arrow-up").addClass("expand-tab-arrow-down");
        $("#exa1").removeClass("expand-tab-arrow-up").addClass("expand-tab-arrow-down");
    });
});