Howto adres a detail region from another java script or href

I've set up a site with the spry regions and detail regions, loading from an external xml file.
here it is: http://www.mulleners.nl/nieuw/projecten.html
when you switch between "deventer" and "arnhem" you see the image switching, and also the amount of points on the bottom of the page. These points should show some more images of the same project. Now only the first picture is shown.
At the moment this is the image source img src="images/{nr}/1.jpg".
The {nr} is the project number, which has its corresponding folder.In this folder there are a couple of pictures (1.jpg, 2.jpg, ...etc)
So what i'm trying to do is replacing the "1" by a variable which I can adres with a java script.
Any help/suggestion on how to solve this? Or comments on the general approach?
thanks,
sven

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