That custom script is using youtube's API to grab the videos directly from youtube.com and showing it in their content. There is one script name TopMediaScript I heard few days ago at DP which is using the same youtube API to grab the videos, you may look for that one.
Howdy - its actually AutoVideoScript which auto-updates using the youtube API; TopMediaScript is similar to sites like Break.com etc. They're both my scripts so if you have any questions about them please feel free to drop me a line or check out their respective threads (links in my sig)