How I install drRacket?

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http://askubuntu.com – i install drRacket in ubuntu. downloaded the source file from http://pre.racket-lang.org/installers/ and typed sudo ./racket-5.2.1-bin-i386-linux-ubuntu-karmic.sh after making it exe file so the file is in the usr/racket/bin/drracket and i want to run it from command line without going to its directory i cant make the drracket to run the .rkt files by the "open with" how can i make this two things ??? (HowTos)