To use Flash in WordPress:
1 Create and test your flash file locally, when you’re done – write down the movie size (Height,Width)
2 Upload your .swf file (make sure you have a good preloader if the file is larger than 50k)
3 At the end of the upload you will get the file link, copy it.
4 Go to the post where you want to insert the flash movie. Put your cursor where you want the movie to appear.
5 In HTML view type this syntax:
Replace “link to/MYFLASHFILE.swf” with the link you copied from step 3.
Replace the ” height=”250″ width=”400” numbers (250 and 400) with the numbers from the first step.
6 Save the post. Click on the movie in the post to run it.
Example:
With thanks to Yaniv Steiner (this uses the great Kimili Flash Embed Plugin).
For more information go to the plugin site here