NoClassDefFoundError: if project created in IDE...

First let me say that I'm a total Java beginner. I know C/C++ pretty well, so I'm not a programming newbie. I don't know what the deal with this is, but it's driving me batty. Not wanting to use notepad because of its lack of assistance, I've tried using the Netbeans IDE to do so and every time I compile a program inside Netbeans it works just fine in the IDE. However as soon as I try running it outside the IDE I get the following message:
Exception in thread "main" java.lang.NoClassDefFoundError: firstpr
ong name: firstprogram/Main)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Sou
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Meth
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Sour
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Now, there is a package created in the project by default and as such, the command I'm using to call it is java firstprogram/main from the directory below where main.class is located. If I try to execute that command from the directory main.class is in, it can't find the class file, which doesn't surprise me.
However, if I type a bare version of this program in notepad, without all the fancy stuff that Netbeans tosses in there for you when you first create the project, it compiles just fine with javac and runs fine with the command line. Netbeans must be doing something to cause this problem, but I'm at a total loss to figure out what it is. Please help!

Now, there is a package created in the project by
default and as such, the command I'm using to call it
is java firstprogram/main from the directory below
where main.class is located. If I try to execute
that command from the directory main.class is in, it
can't find the class file, which doesn't surprise me.If firstprogram is a package name, you should be using
java firstprogram.main to execute.
BTW, it is better to use first letter in uppercase for a class name. It helps in distinguishing a class name from a method/variable name. :)

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Message was edited by: Anthony M Kassir MD

(when prompted to save the project's changes when
quitting, I said NO, don't save changes).
Excellent! That should leave you in pretty good shape. More below.
I don't know if I should use older versions of iMovie
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iMovie 2 and 3, but not 4 or 5. I don't know if older
versions would even work on my Quad G5 with OS
10.4.7.)
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I also don't know if the older versions of
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How can I find iMovie 4 or
5 if I need it?
eBay?
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