The best way is to include this tag where you want the flash module to appear:
<script type="text/javascript" src="/ChatRoom/ChatRoom_fixed.js"></script>
You could also use the embed in a web page method. Check the instructions here:
http://www.flasherize.com/install_chat.php?#publish
Enter your web adress in the input field, press generate and copy the code in the box below "2. Embedded in a web page".
You can edit the html page to change background color in the frame that contains the flash.