Including a script with innerHTML - escaping characters
===

I'm trying to output a `<script>` element in an innerHTML:

    <script type="text/javascript">
        function fileManager()
        {
            data = document.getElementById("FM");
            data.innerHTML = "<script type='text/javascript' src='functions.js'></script>";
        }
    </script>
        <div id="FM"></div>
        <ul id="show-menu">
        	<li onClick="fileManager()">File Manager
        </ul>

The innerHTML bit of the script works perfectly, it's just that there's a problem with escaping characters inside the double quotes ("). The whole `<script type='text/javascript' src='functions.js'></script>` seems to be broken/written incorrectly and I can't seem to figure out what's wrong with it.

In case you're wondering, the functions.js file contains only `document.write("test");` for testing purposes.

For some unknown reason this does not work. The result is a broken page, I see bits of other functions in the script and it doesn't make sense. How do I escape it correctly?