Help needed with Spry Grow/Shrink Query!

Dear All,

I am attempting to use the new spry effects in cs3 to grow ( and the optionally shrink) a city map for users.
My difficulty is that if you use an image at the correct 100% size, but want to grow it from 10%, the 100% image displays as default when you load the page, then once clicked it reszies up from 10%.

I cant use a 10% image as my start point, because then the 'grown' map is illegible.

Any tips?

Cheers

Si