Setting Classpath for Tomcat

I have tomcat running as a service on Windows Server 2003 (32 bit).  I need to set the class path variable prior to starting tomcat, and I am getting this error using the code below.  

[420 prunsrv.c] [error]
The operation completed sucessfully.
[1327 prunsrv.c] [error]
Load configuration failed

Is it possible to do what I'm trying to do and does anyone know what I'm doing wrong?

Thanks in advance

set path=%JAVA_HOME%\jre\bin;%JAVA_HOME%\jre\bin\classic;%JAVA_HOME%\bin;%path%;
 
call "C:\Tomcat_5.5.25\bin\tomcat5.exe" "//RS//Tomcat5 ++Classpath=%ADVISOR_COMMON_HOME%\lib\hsqldb.jar;%CLASSPATH%;"

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