Embed script using javascript

embed.html

<!-- Embed -->
<div id="my-embed-content"></div>
<script>(function(d, s, id) {
        var my_account = 123;
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "//the.location.of/my/embed.js#acc="+my_account+"&w=900&h=700";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'my-embed'));</script>
<!-- /Embed -->