thanks for your reply, but this is not what I’m looking for. Maybe I didn’t explain myself well.
within the existing wrapping there is height of 445px. I have a picture with height of 745px. what currently happens is that the bottom of the picture is catted off. only the top 445px are shown.
I would like to show the middle(centre) of the picture. meaning – catting 150px from the top of the picture and 150px from the bottom of the picture. it suppose to be some kind of parameter that centralise the vertical part of the picture.

Thanks,