java_home warning

[Ramasubbu, Hari]

I have a question .I have set the java_home env variable in my win 2000
machine .but still i get this error on my command line .
-----------------------------------
   C:\>ant

Warning: 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.

Build failed
-----------------------------------

any help is greatly appreciated.

thanks :)
hari