Viewing Flash files in Preview mode
If you are receiving an error message or crashed when viewing embedded flash files you may need to add some folders on your Mac to Adobe Flash Player's 'Safe List' which enables the slideshow to connect to Flickr. To do this, open Safari and visit this page on the Adobe Help Centre. In this page, a small Flash player will open: this is not an image - it's actually the settings for Flash on your system.
Add private/var/folders/* to the safe list using
the Edit Locations drop down.

Now you should be able to view Flash files in RapidWeaver.
Adding a Flash video to your site.
Many video sites like YouTube and Vimeo offer Embed code snippets for use on your site. The trouble is they use invalid <embed> tags. If you're the type of person that cares about this type of thing you can use the following snippet to embed Flash movies on your site.
<div id='flashcontent'>
This page requires Adobe Flash Player. You can replace this text with any other content. It will be displayed if the user does not have Flash installed.
</div>
<script type='text/javascript'>
var so = new SWFObject('{url_to_movie}', '{movie_title}', '{width}', '{height}', '{flash_version}', '{background_colour}');
so.write('flashcontent');
</script>
Replace the tags in curly braces with your videos info. For example.
<div id='flashcontent'>
Hi this section of the page requires Flash Player to view it. You can download this from <a href='http://www.adobe.com/products/flashplayer/' title='Link to Adobe Flash Player'>Adobe</a>.
</div>
<script type='text/javascript'>
var so = new SWFObject(
'http://www.youtube.com/v/UXziurFkQxM&hl=en',
'Procrastination',
'425',
'344',
'8',
'#ffffff'
);
so.write('flashcontent');
</script>
And lastly, don’t forget to highlight the code and select Ignore Formatting from the Format menu.