http://scala-ide.org/docs/user/gettingstarted.html
"The list of URLs of various update sites is available in the download area. The release is in the current section. The Scala IDE is associated with a specific version of Scala, so you need to decide which one you are going to use:
release-29 provides project support using Scala 2.9.x (2.9.0-1 or 2.9.1). This is the current version of Scala. Choose this option if you are not sure.
release-28 provides project support using Scala 2.8.x (2.8.1 or 2.8.2).
Therefore, you need to install release-28 Scala IDE to compile your Scala project with version 2.8.1.
The release site can be found here: http://scala-ide.org/download/current.html
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