The website seems to be down, because I am getting 503 response from it. Anyway, the error you see
"element.style is undefined" means that the lightbox.js script is not loaded, you have some other script that breaks the behavior of the lightbox script or MS Ajax is not loading.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items