Using Nextgen in sidebar

I am using nextgen to display different galleries on each page but I am using it in the side bar, and I can’t work out how to make each separate page show a different gallery – can anyone tell me if this is possible?

Also I’m trying to set up the gallery so that it works like this http://www.englishoakframes.com/about.asp. This is where I’m at so far! http://c5546827.myzen.co.uk.

Any help would be very much appreciated!