need instruction to compile source to l2jserver.jar

[CyberCop]

hey dudes..
i got some trouble compiling my source into l2jserver.jar...
i'm using java 1,5 and eclipse. i decompile the l2jserver.jar with DJ JAVA DECOMPILER. i hope this is no problem for forwarding actions..
so far... i edit the .jad files in eclipse, but when i try to recompile it (with compiler 5.0) i get some errors..
can you give me a detailed instruction how to compile the source into java ?? the tuts on WIKI page dont work for me...

i realy dont know what to do, i need some changes for my server... but cant

plz help me guys and girls ;-)

[MentaL]