ZK - Open Source Ajax Java Framework

I tried using tools -> Java plattaforms ->
javadoc and also tools -> libraries -> javadocs but
failed.
the file I'm using is zk-javadoc-5.0.4.zip

Hi mhj,
Step 1. Go to Tools>>Libraries
Step 2. Create New class library by clicking "New Library" button
Step 3. On the right side panel you will see 3 tabs Classpath Sources and Javadoc. Add ZK libraries (jar files) on the classpath tab
Step 3. On the Javadocs tab add zk-javadocs-5.0.4.zip by clicking "Add ZIP/folder" button
Step 4. Add ZK source zip on Sources tab if you are also interested in checking out the source.
and you should be all set

I did so, only it did not work.
add-javadoc-5.0.4.zip zk, zk-src-5.0.4.zip.
The plugin I use is net-sf-rem500.nbm

are you sure you have done the step 3.
>>Step 3. On the right side panel you will see 3 tabs Classpath Sources and Javadoc. Add ZK libraries (jar files) on the classpath tab
If it isn't yet working please remove ZK Class library and try again. Also try restarting Netbeans IDE after ading ZK class library.
BTW how exactly are you verifying it is working or not?

jars are installed (the library name is ZK5.0.0), they must be added time to install the plugin net-sf-rem500.nbm. added the zip in this library.
I'll try reinstalling again.