How to use CS4 extention on CS3?

[vaibhavsitc]

Is there any way we can use these extension for CS3 or they are designed only for CS4?
If they are designed only for CS4 wht should a person do who has already bought CS3?

Extension like Lightbox, Thickbox, Flash Gallery etc

[Danilo Celic]

Some extensions can be installed in previous versions. If you've tried to install them and you can't install them (getting a message that CS4 or higher is required or similar message), then you can't install them into CS3. Of course upgrading is an option, but if that's not good for you for whatever reason, then what you can do is to add the code to your page/site manually rather than via the extension. Some extensions are based upon open source JavaScript libraries and have downloads with instructions. I'm sure that Lightbox and Thickbox are available in that way, just search for them on Google.