Convert defaultImage on OneVarient to hyperlink

I need to make the default image on the OneVarient product page a hyperlink that opens the full resolution version of the product image in a new page. I attempted to change the defaultImage control to a Hyperlink and set the ImageURL in the code behind but it complained that defaultImage is in the casecontrol and cannot be changed.  I'm wondering what the easiest way to accomplish my goal is. If it must be, I can also lauch the full res image froma text link, something like "Click here for Larger Image"

.

admin ---> configuration--> all settings


find
Media.Product.DefaultPictureZoomEnabled   (probably page 7 )

and set it to true   ( remember to save)

no code changes needed      :)

- hayden

Thanks for the reply! Sounds great. Must be 1.6+ though as I don't see the setting in 1.5. I guess it would be quite easy to steal just that setting and the related code from the new version though. Thanks again!