How many JRE versions necessary?

Hello!
Although, I did some programming 2 years ago, I recently have not done any programming at all. However, my "Java Update" program keeps downloading a new JRE every other month. So now I have plenty of JRE's:
jre1.5.0_03
jre1.5.0_06
jre1.5.0_09
jre1.5.0_10
jre1.5.0_11
jre1.6.0_01
jre1.6.0_02
jre1.6.0_03
Every new version takes an additional 80 MB. Is it really necessary to keep all those versions on my harddisk? That is, do websites or other programs definitely need any specific versions? Or can I delete any and if yes, which versions?
It is quite disappointing that 'Java Update' does not provide any hints to these questions and just dumps everything on the harddisk, especially because nowadays everybody (also grandparents) seems to have Java Update installed.
Thank you very much for your answers.
Peter

@chuckbing:
1)So what's your final advise? remove the bunch of JREs? or keep them to be sure? (your sentence contains a conflict: you say first that Cathadras is right -cathadras is saying that you can remove it without doubt- and in the remainder of that sentence you say that "versions have to be kept to ensure that applications that require a specific versions will continue to run without problems")
2)how can you change that an application must use another JRE? I have here for example several java programs that i have to start with an EXE file, and I really don't know how to change the JRE that came with it !!!! (after all, I think it's not the task of the customer to verify if an application works fine on the newest JRE)

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