starting mongodb outside of path

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http://serverfault.com – I've just installed mongodb, and had to install 2.0.4, which I couldn't figure out how to do with 10gen, so followed this tutorial and installed from the tar file. http://antimalwarelab.com/installing-ubuntu-10-04-1-lts-64-bit-mongodb-2... Now, in order to start the server, I have to go to ~/mongodb-linux-x86_64-2.0.4/bin and then type ./mongod. But all the guides I see online say to just type mongod at the command line. What do I need to set-up in order to not have to go through the path? (HowTos)