test mod/no-mod icon

// ==UserScript==
// @name        Test sprite
// @description hide questions by score, user reputation and accepted answers
// @namespace   http://stackapps.com/users/10590
// @author      brasofilo
// @version     0.3
// @copyright   2014, Rodolfo Buaiz (http://stackapps.com/users/10590/brasofilo)
// @license     ISC; http://opensource.org/licenses/ISC
// @match http*://*.askubuntu.com/questions*
// @match http*://*.askubuntu.com/unanswered*
// @match http*://*.mathoverflow.net/questions*
// @match http*://*.mathoverflow.net/unanswered*
// @match http*://*.serverfault.com/questions*
// @match http*://*.serverfault.com/unanswered*
// @match http*://*.stackapps.com/questions*
// @match http*://*.stackapps.com/unanswered*
// @match http*://*.stackexchange.com/questions*
// @match http*://*.stackexchange.com/unanswered*
// @match http*://*.stackoverflow.com/questions*
// @match http*://*.stackoverflow.com/unanswered*
// @match http*://*.superuser.com/questions*
// @match http*://*.superuser.com/unanswered*
// @homepageURL http://stackapps.com/questions/
// @grant       GM_addStyle
// ==/UserScript==

GM_addStyle("\
.se-app-gear1 {                                                                           \
    background: url('http://i.stack.imgur.com/I5vIL.png') no-repeat -2px -2px !important; \
    width: 24px !important;                                                               \
    height: 14px !important;                                                              \
    margin-top: 9px;                                                                      \
}                                                                                         \
.se-app-gear2 {                                                                           \
    background: url('http://i.stack.imgur.com/I5vIL.png') no-repeat -2px -20px !important;\
    width: 24px !important;                                                               \
    height: 14px !important;                                                              \
    margin-top: 9px;                                                                      \
}");

var userscript = function($) {
    var testForMod = function() {
        return $('div.topbar-links').find('.mod-only').length;
    }

    $class = testForMod() ? ' se-app-gear1' : ' icon-inbox-mod';
    var $html = '<a href="javascript:void(0)" id="my-se-mod" class="topbar-icon yes-hover' + $class + '" title="Testing mod icon"></a>';
    $($html).appendTo('div.network-items');
    var $icon = $('#my-se-mod');

    $icon.hover(
        function () {
            if( testForMod() )
                $(this).removeClass('se-app-gear1').addClass('se-app-gear2');
            else
                $(this).addClass('icon-inbox-mod-announcements');
        },
        function () {
             if( testForMod() )
                $(this).removeClass('se-app-gear2').addClass('se-app-gear1');
            else
                $(this).removeClass('icon-inbox-mod-announcements');
        }
    );
};

var el = document.createElement('script');
el.type = 'text/javascript';
el.text = '(' + userscript + ')(jQuery);';
document.head.appendChild(el);