domready IE8

I keep running into a huge issue with a piece of Javascript only in IE8 (surprise!). I found a website that suggests using the domready script, but I’m having a hard time trying to call it. My problem is I don’t know how to call a piece of Javascript from inside another formula. Here’s what I have to call the domready script:

<script src="domready.js" type="application/javascript"></script>
        <script type="application/javascript">
                DomReady.ready(function() {
                    alert('dom is ready');
                });
        </script>

And I need to swap out the “alert(‘dom is ready’)” with my code:

<script type="text/javascript" src="https://www.site.com"></script>

Suggestions on how to do this?

Thanks