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//Put in document ready
// This will fire when document is ready:
    jQuery(window).resize(function () {
        // This will fire each time the window is resized:
        if(jQuery(window).width() <= 1024) {
            jQuery('.nav-header').addClass("is-mobile");
        } else {
            jQuery('.nav-header').removeClass("is-mobile");
        }
    }).resize(); // This will simulate a resize to trigger the initial run.