Deleting Java SE Runtime Environ Updates

I have a laptop quickly running out of disk space, can you tell me if I can delete any of these huge updates through WIndows Add or Delete Programs?

Java SE RUntime Environment 6 Update 1

Java 2 RUntime Environment, SE v 1.4.2_03

Java SE Runtime Environment 5.0 update 6

Java SE Runtime Environment 5.0 update 3

Java SE Runtime Environment 5.0 update 10

Each is over 100MB and I'm wondering if only the Highest version and highest update number are necessary

Thanks

[515 byte] By [awang429a] at [2007-11-27 3:54:34]