Installing IntelliJ on Ubuntu Problem

Hi!
I am facing a problem that has made my life miserable. I am using Ubuntu 10.04 and I have download the java jdk 6 by the command
sudo apt-get install sun-java6-jdk
I can see the java version by java -version

I downloaded the intellij Idea and extracted in my /work folder.

Secondly I tried
export JDK_HOME="/usr/lib/jvm/java-6-sun/"
and started ./idea.sh but it is giving me error

Cannot find Java Home or JDK Home and IDEA Home
something like that.

I just dont know what Am I missing.
Please help me in this regard as I am already late for work I was supposing to be doing.

I would highly appreciate a complete solution to the problem.

Thanks