Expanding content or panels are a little different than a "lightbox" style popup.
In a lightbox (see lightbox blog), the content usually appears by "floating" in the middle of the screen, and the rest of the screen goes dark around it.
In a slideout panel, the entire panel usually grows by expanding along the top, bottom, or side of the browser window. Depending on the implementation and the page layout, the expanding panel may either overlap the page content, or the panel may "push" the page content out of the way (the "push" method would only work effectively with top or bottom panel placement). Generally, the overlapping style is more common. There is generally no darkening of the surrounding page content when this method is used.
http://web-kreation.com/demos/Sliding_login_panel_jquery/
http://jalbum.macosxsupport.com/
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| Slideout Panel vertical |
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| Slideout Panel left |
In expanding content, the expanding container simply grows its dimensions, usually in an overlapping manner. Again, there is generally no darkening of the surrounding page content when this method is used.
http://demo.tutorialzine.com/2010/04/slideout-context-tips-jquery-css3/demo.html
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| Expanding content |
The Jquery plugins homepage should provide a good source of ideas and possibilities.





