How to run SoapUI with different java versions

Hello, All,
I have two versions installed on my windows XP.
jdk1.5.0_22 and jdk1.6.0_23.
But in soapUI system properties here are the fowolling info:

java.home=c:\program files\eviware\soapui-3.5\jre
java.io.tmpdir=C:\DOCUME~1\emild\LOCALS~1\Temp\
java.library.path=C:\Program Files\eviware\soapUI-3.5/bin
java.runtime.name=Java(TM) SE Runtime Environment
java.runtime.version=1.6.0_18-b07
java.specification.name=Java Platform API Specification
java.specification.vendor=Sun Microsystems Inc.
java.specification.version=1.6
java.vendor=Sun Microsystems Inc.
java.vendor.url=http://java.sun.com/
java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport.cgi
java.version=1.6.0_18

How to make SoapUI to use JDK 1.6.0 and all of its classes?