"Center to selection"-script?

Hi!
I wonder if there's any way of centering one layer (moving it) depending on a selected area or spot. I have a big map which is a huge layer and I'm supposed to cut it into many smaller pieces highlighting only some selected areas (see picture below). Since there's alot of areas I'd like to make as much of it automatically and I've managed everything else by by using actions but I can't figure out how to center the layer so that the selected area is the one in the center.

Can this maybe be done using scripts? If so, how? I know nothing about scripting..

I'm also interested in a script that can save and image to something based on a text layer, eg: myimagename + "_" + textlayer1.contents + extension
or something similar..

Thanks in advance!
/ante