enterprize java bean (ant installation)

[ravindra ghetia]

dear friends ,
when i try to compile my java files through
ant i get following message.
JAVA_HOME environment variable is not set.
If build fails because sun.* classes could not be found
you will need to set the JAVA_HOME environment variable
to the installation directory of java.

actually i do not know how to set home
variables in java
i already install jdk1.2.2 in c drive .
i also install ant in c drive in ant folder.
what can i do now???

[Ajith Kallambella]

If you are running windows, see help on "environment variable". Alternatively you can use SET JAVA_HOME = .... from the command prompt and invoke ant from the same shell.