swfObject Reloaded

Upload the swf, either directly into the Media Library or when creating or editing the post (or page).
Enter the width and height of the swf. If the swf requires a different version of Flash than you have
configured in the 'Settings->Media' menu in WordPress, enter that version number also.
Click 'Insert into Post' to embed the swf. This will add the swfobject shortcode to the post (or page).
At this point, you can edit the shortcode to provide other parameters for the swf, if desired.

What are the other parameters available for use with the swfobject shortcode?
At a minimum, the swf media file must be specified, either as the media ID number (entered automatically by
swfObject Reloaded when the swf is inserted into the post or page), or as a URL.

Here are all the parameters that can be specified:

media ID or URL (required)
width
height
flashvars
base

Parameters must be entered in the order shown. To skip a parameter, just leave it completely blank (i.e.,
don't type anything) followed by the comma to separate it from the next parameter.

See Flash OBJECT and EMBED tag attributes for more information on using the flashvar and base parameters.

Examples:

[swfobject]573[/swfobject]

This is the simplest usage, specifying only the media ID of the swf.

[swfobject]http://www.example.com/test.swf,300,200[/swfobject]

Another simple example using an external URL. Note that the width and height parameters should be specified.

[swfobject]http://www.example.com/test2.swf,250,120,foo:"bar"|bar:"baz",http://www.example.com/[/swfobject]

This example uses an external URL, and includes the width, height, flashvar (foo:"bar" and bar:"baz") and base
(http://www.example.com/) parameters.

Flashvars are separated by a delimiter that cannot be a comma. You can change the delimiter by passing a delimiter attribute.
[swfobject delimiter='&']12,,,foo:"bar"&bar:"baz"[/swfobject]

What if I only want to display a link to the attachment page?
Use the swflink shortcode in the form of [swflink]ID[/swflink].
For example [swflink]573[/swflink]
What size will the swf file be when displayed?
The screen size of the swf file is determined by checking for the following, in this order:

dimensions specified in the shortcode
dimensions assigned to the media in the Media Libary
dimensions configured as the "Maximum Embed Size" on the Settings->Media menu
dimensions configured as the "Image Sizes->Medium Size" on the Settings->Media menu

If none of those are found, an error message will be displayed instead of the swf.
What is the maximum size to which the swf will will be scaled?
If Scale Flash Content is checked, the screen size of the swf file will be scaled (preserving its aspect ratio) to:

dimensions configured as the "Maximum Embed Size" on the Settings->Media menu
dimensions configured as the "Image Sizes->Medium Size" on the Settings->Media menu

Scale Flash content - Checking this box will cause excessively large or small flash content to be scaled to
the "Maximum embed size", if any, entered on the 'Settings->Media' menu (or the "Medium Size" on that same
menu if no maximum size is entered). The original aspect ratio will be preserved.
iPhone Alternate content - iPhones do not currently support Flash content. The text entered here will be
displayed if the user is accessing the site via an iPhone.
Alternate Content - If Flash is not detected on the user's browser, the text entered here will be displayed.
additional params - These are the parameters in name:"value" pairs that are applied to every instance of the
swfobject shortcode. See Flash OBJECT and EMBED tag attributes for more information on using parameters.
Minimum Flash version - This is the minimum Flash version that can be embedded on your blog. This can be
overridden by setting the value on the media itself when it's added to the Media Library.