WordPress Conditional PHP Includes

[gofstawerks]

So I was trying to use conditional php includes to customize an existing WordPress Template I just bought.
I know nothing about PHP, however I’ve been trying to search and find answers as a go along. Something that I have not been able to figure out is how to do a conditional PHP Include. Everytime I try, I get a blank white page :? . Heres what I tried and my source. I also posted this in the PHP section, didn’t know which place would be the more relevant section to post it in.
The source code from – http://codex.wordpress.org/Category_Templates

Code:

This is the text to describe category A

This is the text to describe category B

This is some generic text to describe all other category pages,
I could be left blank

what I turned it into

Code:

ID); ?>

Thanks in advance and sorry if it is a stupid question.

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