more flexible image size for trigger "image click"

[hugofant]

Hi,
i the meantime i've tested a few modal blocks and this one looks very promising.
One thing missing: on my site, i'm using the same images for buttons with different sizes.

In the modal block i've only the possibility to switch between preselected sizes (thumb, full..) - would be great if i could select the size for the picture to be shown individually(in px). Then one picture could be used for every button and modal block.