[TYPO3] Mask only if click enlarge is on

[Costa Papadopoulo]

Hi all,

With images I achieved taht I can render magnifier on it like:

tt_content.image.20.1.file.m.bgImg = fileadmin/img/lupe.png
tt_content.image.20.1.file.m.mask  = fileadmin/img/lupe.png


My problem now is, that I want to show the magnifier ONLY if "click enlarge" 
is on.

I tried if, but I find this function very wiered to work with, at least very 
uncomftable for me....

Anyone has suggestions ?

Thanks