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With the Thickbox Announcement you easily can set-up an announcement, which will be displayed in a thickbox (lightbox). 
Several options let you control the apperenace and the frequency of the announcement. You can display any external 
content using an iframe or an inline content which can be edited using the standard wordpress editor.
<h4>Update Information</h4>
I’ve renamed my plugin since the plugin named looked very irritating. Since Version 1.0.3 the plugin is simply called Thickbox Announcement. 
If you are still using Version 1.0.2 no updates are displayed in the plugin overview of your wp installation. To perform an update 
you have to use the function Add New and search for this plugin. Click on Update to perform the automatic update.

Thickbox Announcement

With the Thickbox Announcement plugin you easily can set-up an announcement, which will be displayed in a thickbox (lightbox).

Elio Rivero

ILC FLVBox will parse your post content looking for links to FLV videos. When found, it will add a player to play it inline or in a modal dialog.
The modal dialog is currently handled by ThickBox, which requires jQuery. Both Thickbox and jQuery are loaded from the versions included with WordPress using wp_enqueue_script.
http://jquery.com/demo/thickbox/ 
http://jquery.com/
The FLV players included are:
http://miplayweb.com/player/ 
 
http://osflv.com/
The player embedding uses SWFObject 1.5 (sometimes IE6 doesn’t get along nice with SWFObject 2.1 dynamic publishing, as soon as this is sorted out the SWFObject included will be upgraded).
http://blog.deconcept.com/2007/02/28/swfobject-1-5-released/ 
http://code.google.com/p/swfobject/ (current 2.1 version)
This software is provided without warranty of any kind.
There’s an option page with an option to select an FLV Player. You can choose here your player, MiPlayWeb or OSFLV. If you select OSFLV more options are unfolded (background and foreground colors, initial volume level). Flowplayer player will be added later to the list of optional players.
When you check the box enabling ThickBox, a textarea is unfolded containing an CSS file that will allow you to set the style of the inline image. You can also edit this file independently on your editor of choice, by opening the flvbox.css file. If Thickbox is in use, the player is set to autoplay, so when you click on the image launching the player, the video will start inmediately.
The FLVBox dimensions option sets the size of the player (indirectly, the video, but not specifically). The ThickBox area is adjusted accordingly.
There’s one last field in case you need to rename the folder or change the path of ILC_FLVBox. 
Both Thickbox and jQuery are loaded from the versions included with WordPress using wp_enqueue_script.

ILC FLVBox

Plays FLV video inline in content or in a modal dialog.

Thickbox Announcement vs ILC FLVBox