[Gvsig_english] problems installing gvsig without prerequisites

[G. Allegri]

Hi,
I'm trying to install gvSIG without jre bundled. On my machine I set up this
Java software:

 - j2re1.4.2_14
 - j2sdk1.4.2_14
 - jre1.6.0_01 (with JAI and JAI I/O)

When I launch gvSIG setup it asks me for the JAI to be downloaded.
I need the two jre for different softwares. How can I "tell" gvSIG to pick
the right one jre, as in the 1.6 JAI is already installed?
Thanks!
--
Giovanni
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