Adding a simple Mouse Over function to the Thumbnails in the Grid Gallery of Native

Hi, I recently posted a question about how to add a dynamic rollover function to thumbnails in the Grid Gallery of the Native template.

http://answers.squarespace.com/questions/23440/adding-a-dynamic-rollover-to-thumbnails-in-the-grid-gallery-of-native

I wanted to dynamically fetch and display the title and description of the thumbnails on rollover. Unfortunately there was no response.

I was wondering instead if anybody knew how to add any kind of rollover function. Maybe just a colour tint or opacity change?

Many thanks in advance again guys!