Using the flash.js javascript file in the head of your document.
<script language="JavaScript" type="text/JavaScript" src="flash.js"></script>
In the body of your document use:
<script type="text/javascript">
FlashMovie('flashfile.swf', '500', '300');
</script>
Set the dimensions to your current flash settings, where 500 is the width and 300 is the height.



