Creating a jar file

Hello all. I am trying to create a jar file for a *"hello world"* program. I compiled the code using netbeans and created the jar file from the HelloWorld.class. I added the main class to the manifest with the following line
Main-Class: helloworld.HelloWorld
Ensured there was a carriage return just before the end of the file.
When I run the program I get the following error:
h1Exception in thread "main" java.lang.NoClassDefFoundError: helloworld/HelloWorld*
Please help

I tried the last command it produced this error
*C:\Documents and Settings\oshonowo\My Documents\Projects\DOS>set JAVA_HOME=c:/Pr
ogram Files/Java/jdk1.6.0_03
C:\Documents and Settings\oshonowo\My Documents\Projects\DOS>set classpath=C:\Pr
ogram Files\Java\jdk1.6.0_03\lib\;C:\Program Files\Java\jre1.6.0_03\lib\ext\QTJa
va.zip;C:\Program Files\Java\jdk1.6.0_03\jre\lib;C:\Program Files\Java\jre1.6.0_
03\lib;%CLASSPATH%;.;C:\Documents and Settings\oshonowo\HelloWorld\build\classes
\helloworld\Hello.jar
C:\Documents and Settings\oshonowo\My Documents\Projects\DOS>"c:/Program Files/J
ava/jdk1.6.0_03\bin\java" helloworld.HelloWorld
Exception in thread "main" java.lang.NoClassDefFoundError: helloworld/HelloWorld
C:\Documents and Settings\oshonowo\My Documents\Projects\DOS>pause
Press any key to continue . . .*
Please help

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Adeyi wrote:
..I created a Manifest.txt file inside c:\diagapp3 containing the following:
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