postgresql-9.2-1002.jdbc4.jar does not work with Java6

Hi,

when trying to use postgresql-9.2-1002.jdbc4.jar with Java6 I get the following exception:

java.lang.UnsupportedClassVersionError: org/postgresql/Driver : Unsupported major.minor version 51.0

It works fine with Java7.

Is this intended? If yes, I think then description on the download page

    "If you are using the 1.6 or 1.7 JVM, then you should use the JDBC4 version."

should be updated.

Regards
Thomas