Setting a java variable in javaScript

I am not really sure if this is possible and do not have much experience in using javaScript, but I was wondering if it is possible for me to take a variable that I have declared in java and change its value in javaScript.

I have a mixed java file that consists of both java and javaScript.

I need to create an If statement in javaScript which takes a java variable and sets its value to null if I meet a certain condition.

Would this be possible, and if so can someone provide me with a simple example?

Thanks,
Shawn

Have a look at the following page from Oracle's Tutorial: Invoking Applet Methods From JavaScript Code (The Java™ Tutorials > Deployment > Java Applets)