include jquery + jquery-ui in WP functions.php

// Load jQuery & jQuery UI
function load_my_jquery() {
    wp_deregister_script("jquery");
    wp_deregister_script("jquery-ui");
    wp_deregister_script("jquery-ui-core");
    wp_deregister_script("jquery-ui-tabs");
    wp_deregister_script("jquery-ui-sortable");
    wp_deregister_script("jquery-ui-draggable");
    wp_deregister_script("jquery-ui-droppable");
    wp_deregister_script("jquery-ui-selectable");
    wp_deregister_script("jquery-ui-resizable");
    wp_deregister_script("jquery-ui-dialog");
    wp_register_script("jquery", "https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js", array(), "1.7.1", true);
    wp_register_script("jquery-ui", "https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.min.js", array("jquery"), "1.8.18", true);
}

function print_my_jquery() {
    global $add_my_jquery;
    if (!$add_my_jquery) { return; }
    wp_print_scripts('jquery', 'jquery-ui');
}

if (!is_admin()) {
    add_action("init", "load_my_jquery");
    add_action("wp_footer", "print_my_jquery");
}