var hostname = 'www.easymailing.eu';
    var loaderScriptId = 'easi-plugin-loader';  // you could encode the css path itself to generate id..
    if (!document.getElementById(loaderScriptId)) {
        var head = document.getElementsByTagName('head')[0];
        var script = document.createElement('script');
        script.id = loaderScriptId;
        script.type = 'text/javascript';
        script.src = '//' + hostname + '/frontend/easiplugin.php?load';
        head.appendChild(script);
    } else {
        if (typeof loadframe !== "function") { 
            loadframe = function(){};
        }
        loadframe();
    }