For those who are curious as to which resize mode/ script to use, here's a great summary of the features of each one:
http://planetozh.com/projects/lightbox-clones/
Personally, I prefer LightWindow or ShadowBox due to their video support. However, if you're having problems with those scripts, then try Highslide.
Feature request: enable these scripts (LightWindow and/or ShadowBox) to display inline and attached video and flash files? Thanks for considering.