Lot's of Java Runtime Environments....?

well... after one update after another my computer ends up having all of the following:

J2SE Runtime Environment 5.0 Update 9

J2SE Runtime Environment 5.0 Update 10

J2SE Runtime Environment 5.0 Update 11

Java(TM) SE Runtime Environment 6 Update 1

Should I leave them all as it is or should i remove the older ones?

[351 byte] By [Alborufusa] at [2007-11-27 0:38:52]