add functions to selenium-server-standalone.jar

In selenium IDE I added gotoIf function and it works perfectly, but how can I add this to my selenium-server-standalone.jar file so I can run my tests from the command line for the other browsers ?
Or in other words how to include user-extensions.js into selenium-server-standalone.jar

What I need to do is check the value of bool and if its true to continue the test if its false to fail. Maybe there is a better and easier way to do this ?

Unfortunately, I don't think that gotoIf function will work running from the command. You can try it by running java -jar selenium-server.jar -userExtensions Path\user-extensions.js I have tried using the while loop from that extension and it gives me errors because it is only usable by Selenium IDE.

Your best bet to get this working is to convert your script to JUnit, copy it into Eclipse and create a function to handle the boolean.