Did a little piece of coding at back-end to find width and height of thumbnails and added to xml feed. It was rather easy but this is what i never wanted.
What I was trying to achieve is to find width and height of photos using jQuery and creating <img> attributes at run-time, unfortunately execution of loop was too fast that image tag was getting populated before jQuery can even cache thumbnails and was resulting in width=NaN 😀
Anyways this approach is working. It was working even without creating placeholder earlier, just only some times my right navigation thumbnail arrow was disappearing 😛 .
Sorry for those, who find it hard to digest… its little techie this time 😀