Change Template For Certain Pages

Hi.

I would like to have extra templates active at different places.
So I wonder how I can change the template for certain pages, in this case to make a more stripped version of the main template to give space for a gallery (it is de facto only a matter of looks, but non the less….. ;p)

Say I have a page with a parent, and upon clicking the link on the parent page (in this case “images”, I open up different galleries through links. I would like those galleries to have a different theme behind them, without the same header and so forth.

Can anyone pls help ?

site as follows; http://www.machinetribe.com

Regards – Dr Waldbach