You should check out swfObject ...
http://blog.deconcept.com/swfobject/
It's pretty easy to use ...
1. Download the .js (javascript file from the swfObject Download page).
2. Stick that .js file is a folder called "scripts" on your web server.
3. Here's what a basic swfObject HTML page will look like ...
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>:: Put Your Web Page Title Here ::</title>
<meta name="keywords" content="Keyword, Keyword, Another Keyword, You get the idea, etc., etc.">
<meta name="description" content="Put your web page description here.">
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="scripts/swfobject.js"></script>
</head>
<body>
<div id="flashcontent">
<div id="noflash">
<h2>
Alternate Content (see next few lines)</h2>
<p>This text will only display if someone doesn't have the required Flash Player. Otherwise it will be replaced by the swfObject code below.</p>
<p>So, for this alternate content you could put something like ... Download the latest <a href="http://www.adobe.com">Flash Player</a> for free! It takes just a few minutes to download and install.</p>
</div>
</div>
<!-- Here comes the magic ...
<script type="text/javascript">
// <![CDATA[
var so = new SWFObject('Your_SWF_FileName.swf', 'Your_MovieName-Call-This-Whatever-You-Want-It-Doesn't-Matter', '650', '400', '8', '#FFFFFF');
so.addParam('allowScriptAccess', 'always');
so.addParam('menu', 'false');
so.write('flashcontent');
// ]]>
</script>
<!-- That's it - that's the entire embed code (above) ...
<!-- See the bold "var so = new SWFObject blah, blah, blah ...
<!-- Well, that's what you're going to change for your site ...
<!-- 650 = Change to the width of your .swf file ...
<!-- 400 = Change to the height of your .swf file ...
<!-- 8 = the plug-in version of Flash required to view your .swf ...
<!-- #FFFFFF = the background color of the .swf file (white in this case) ...
</body>
</html>