standard popup image remove, forum comes close but missing details

[emel]

hi there

i want to remove the option when clicking on an image, a popup appears with the slightly bigger (biggest) image...

i would like to know in which file i need to make some modifications... (and which parameters).
forum comes close but not quite:
http://forum.virtuemart.net/index.php?topic=89387.0

regards
emel