any way to display code or make a codebox?

That sounds like the job of a plugin and unfortunately a quick google search does not turn up any for ckeditor. However, I figured I would at least provide this code highlighter, even though it is for fckeditor. Perhaps you can aid the author or update it to the ckeditor specification. Or you could just use what it is based off of, SyntaxHighlighter which does the heavy lifting.

Hopefully someone has something to add, perhaps their own plugin.

I'm also trying something similar:

http://www.ramble.in/ckeditor/syntaxhighlight/

http://code.google.com/p/ckeditor-syntaxhighlight/

other resource:

http://code.google.com/p/lajox/

I try it tonight

I tried the plugin in the first two links and it works really well.

the problem is with HTML CODE (JAVASCRIPT, PHP WORK WELL) when I want to change it after inserting and saving it, as I said here: http://cksource.com/forums/viewtopic.php?f=11&t=17128

buribus wrote:I tried the plugin in the first two links and it works really well.

the problem is with HTML CODE (JAVASCRIPT, PHP WORK WELL) when I want to change it after inserting and saving it, as I said here: http://cksource.com/forums/viewtopic.php?f=11&t=17128

I hacked out the plugin you're using (ramble.in link). I will have a look at this tonight. I have a feeling I ran into a similar problem and fixed it.

The last link is a rip off of my plugin (I've emailed the "developer" with no response), he literally took my code, obfuscated it slightly, added his own file headers and released as his own.
That or we're clones.