Resizing the gallery image to adjust when scaling browser window?

[spookymix]

How would I go about auto resizing the gallery image to adjust when scaling the browser window? Here's a link to the gallery here... (http://calico9.com/site/lookbook/index.html).

I'm using the Jquery plugin Galleria (http://galleria.aino.se/)

Any help would be much appreciated. Thanks

Mike