No! there is absolutely no way of "hiding" your code from anyone but complete n00bies.
My question to you is:
WHY (1)? - nobody would ever want to reuse your EXACT code - most people check the code to see HOW its done so they can improve their own skillz.
WHY (2)? - Would you really mind people seeing and reusing your code? - i personally make statements on all my sites that say "no part of the code or images on this site are copyrighted - feel free to reuse them" - i would feel happy if my code helped other people make their sites.
ANSWER: You can make everybody aware that YOUR code is Your code by adding a copyright statement at the bottom of your site and in a comment in the code if you REALLY want to, however think about how you learnt what you know - appart form the vey basics, wasnt it by looking at how problems where dealt with on other pages?
Hope you change your mind
Sincerely
Luke