What do warm and cold fronts look like animated?

Really useful animations showing what happens at warm and cold fronts:

http://www.school-portal.co.uk/GroupDownloadFile.asp?File=39951

Here is another version of warm and cold fronts:

http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=visualization