How to use IntelliJ IDEA with OpenJDK7 on Mac?

I'm using Mac OS X Lion.

Installed OpenJDK 7 from

http://code.google.com/p/openjdk-osx-build/downloads/list?q=label:Featured

"java -version" result is,

openjdk version "1.7.0-internal"

OpenJDK Runtime Environment (build 1.7.0-internal-b00)

OpenJDK 64-Bit Server VM (build 21.0-b17, mixed mode)

then when click IntelliJ IDEA 10.5 icon, error dialog pops up.

"Cannot launch 'IntelliJ IDEA', No compatible version of java 1.6 is available"

So I reenabled Java 1.6 with OpenJDK 7 enabled too.

then IDEA runs, but 1.7 target project does not compile.

How can I use OpenJDK7 for IDEA?