PostgreSQL crashes upon startup

PostgreSQL crashes upon startup

Every time I restart my Mac OS X Version 10.8.3. and open PSQL Version
9.2.4.3 (14), the PSQL terminal appears for a second and then shuts down.
Below is the info from the docs http://postgresapp.com/documentation
Uninstalling
What I do to remedy the problem is type these 3 lines of code in bash:
open ~/Library/Application\ Support/Postgres --> I delete the Var folder
sudo sysctl -w kern.sysv.shmall=65536 sudo sysctl -w
kern.sysv.shmmax=16777216
When I restart PSQL, it works. The problem I have an empty database. All
my work is gone. How can I get PSQL running permantely so that I do not
have to restart with an empty database?