I noticed a strange behaviour with Advanced Layer Popup the other day which I cannot sort out:
If I apply this behaviour the frame of the popup window takes the size of the picture, which means that the picture is squeezed:
Example:

The dimension of the actual photo is 396x171.
find it here: test.rhc.at/mahra.at/engl_kinn_ma.html and click on the link called "Pictures"
I had to manually change the size in the javascript code to 400x194 to display correctly.