I have a problem about java version!!

hi, i develop a project on netbeans 5.5 and jdk 1.6 . its ok. there is no problem.

it was my homework. anyway, i sent my class files to school account and i tried to run it , but i encounter an error.

UnsupportedClass .. major.minor .. 50.0

so, i delete my jdk 1.6 and netbeans, and i have installed jdk 1.3 to my computer. then, i 've tried to install netbeans. But , i encounter an error again. I can't install it.

what can I do to solve this problem? this project runs on mycomputer, but doesn't work on school account.

thanks...

[574 byte] By [fuatsungura] at [2007-11-27 6:58:11]