Hello,
I am new to Apex programming. I am having some trouble getting some apex code running.

Environment;
Eclipse 3.3
Apex Toolkit : 8.0.2002
Apex version on my dev account : 8
Salesforce.com instance : NA3

I have been looking at some of the examples available through the reference manual. I can get the triggers and the S-controls to work. I can't get any of the samples involving class declaration to work. I get compile errors. This simple example doesn't work when I compile in eclipse. I created New Apex Package.
I removed the default automatic code ,

package test{

}
and replaced with .

// This class updated the Hello field on account records that are
// passed to it.

public class MyHelloWorld {
    public static void addHelloWorld(Account[] accs)
    {
        for (Account a:accs)
        {
            if (a.Hello__c != 'World')
            {
            a.Hello__c = 'World';
            }
        }
     }
}

I have tried to build this on salesforce.com apex editor and get the error
Error: Compile Error: expecting "package", found 'public' at line 3 column 1

Can anyone tell me if I have an older version of the apex version that uses the older style ( uses packages??, instead of classes) or what I need to do to get these examples working?

Thanks. Your time is appreciated.