Gridworld Case Study - how to use a .jar file with textpad

Hello,
I am a student currently working on a project involving the Gridworld case study. While trying to work on my project at home, I discovered that I would get new "cannot find symbol" compiler errors that I had not previously gotten while compiling the same code at school. I am assuming this has something to do with the .jar file included in the gridworld code. How do I get textpad and/or the java compiler to find and use the .jar file and reccognise the classes which i am importing and extending in my project?
Thanks,
-Alex

Thanks, It works for compiler now.
Now, I write a html to run the applet. appletviewer
says "
java.lang.NoClassDefFoundError: ij/process/ImageProcessor
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
at java.lang.Class.getConstructor0(Class.java:1762)
at java.lang.Class.newInstance0(Class.java:276)
at java.lang.Class.newInstance(Class.java:259)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:566)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:495)
at sun.applet.AppletPanel.run(AppletPanel.java:292)
at java.lang.Thread.run(Thread.java:536)
It seems the appletviewer can not find the right path for the package. How can I fix this?
Thank again,
Hillxy

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