Image Block Modification - How??

Hey Guys,

I have followed a tutorial on how to modify the image block to show 4 images in a quad-type layout (the tutorial from gallery2 support).

That worked perfectly on the site. Heres an example: http://mileycyrus-online.co.uk/g.html

But as soon as i navigate away from the gallery page on my site, Example: http://www.mileycyrus-online.co.uk/ - they appear one above another again.

Can anybody give me a general idea on how to implement the soltuion site-wide, rather than having it just display in a quad config in the gallery???