Incorporating Flash in a Plone site is a not entirely a straightforward process, but is actually quite simple once you know how to do it. There are two options here: embed Flash into your content or embed Flash into a page template.
YouTube and other multimedia sites provide the HTML code necessary to embed a video on your own web site. This code can be inserted into the visual editor's HTML view, as seen here:
In this case, we'll look at the code provided by a YouTube video:
The code we're concerned with here is the Embed code shown on YouTube:
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/-0Sd0Rf_yu0&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/-0Sd0Rf_yu0&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess...