Acessibility font size interactions

I've observed that if I provide font resizing facilities (see click here a site I did for my school) and invoke say the A+ one, If I then invoke the browser facility (CNRL+ in FFox), now increasing the size even further, I cannot return to the page opening font size by using one click of the accessibility reset button. It seems to return to a %age of the result of both resizing actions. Ok, fair enough.

I think the reset SHOULD take it back to the start.

I guess this is a result of the javascript code used. Has anyone tackled this problem before and have a neat solution?

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