This version of visual enrichment is great for Websites with little animated content. It is done on a programming level, similar to the know Action Scripting in Flash. The basic differences between Flash-based and DHTML/CSS :

FLASH / SWISH
-
   Slow load times
   Expensive to develop
+
   Almost unlimited capabilities
   No browser platform issues

DHTML / CSS / JAVA SCRIPT / APPLETS
-
  Somewhat limited capabilities
  Some browser platform issues
+
   Much faster load times
   Faster and much less expensive to develop