Sync 2 tables in 2 databases

Hi,
I have 2 postgres databases with similar structure. I want to keep some tables in sync in these 2 databases(They can be
syncedjust once a day). Is there a way to archive this using function ? 
Something like....

  Select syncTable('foo')

where syncTable is a function that compares table 'foo' in db1 with table 'foo' in db2 and make
changes(update/insert/delete)to 'foo' in db1 

Thanks
Sharmila