Zooming in and out with script's

[formant]

Hi,

I'm trying to build an interactive presentation of digital photography. I'd like the user to be able to zoom in and out of the current image by using two buttons labeled zoom in and zoom out. I can't seem to find a script that will allow this. The zoomin/out script in the libary seems to only allow a predetermined zoom value.

Anyone able to help???

Thanks