Help installing 8.0.2 rpms on RH 3.0

I need some help,

I am doing initial investigation into the next project.  Part of the
project is to upgrade from RH 2.1 to 3.0 (or greater) and to upgrade
from Postgresql 7.3.4 to a newer version.  Currently we are compiling
our version of postgresql and I would really like to get away from
that.   However, I am having some difficulty installing the
postgresql.org RH 3.0 rpms for Postgresql 8.0.2.

Here is what I have:
Virgin install of RH ES 3.0 from cd's (no update run right now)

When I try to start installing the Postgresql rpms, I get the following:
[root@localhost postgresql_rpms]# rpm -Uvh
postgresql-libs-8.0.2-1PGDG.i686.rpm
warning: postgresql-libs-8.0.2-1PGDG.i686.rpm: V3 DSA signature: NOKEY,
key ID 748f7d0e
error: Failed dependencies:
        libecpg.so.4 is needed by postgresql-libs-8.0.2-1PGDG
        libpgtypes.so.1 is needed by postgresql-libs-8.0.2-1PGDG
        libpq.so.3 is needed by postgresql-libs-8.0.2-1PGDG
    Suggested resolutions:
        rh-postgresql-libs-7.3.4-8.i386.rpm

I've tried this with both the  rh-postgresql-libs-7.3.4-8.i386.rpm
installed and not installed and am getting the same results.

What do I need to do to get the rpms to install????

Thanks for any help,

Chris