http://www.cafecounterintelligence.c...p?articleid=23
This security script (PHP), should prevent any connections to your pages from any brute force programs. Also helps prevent flooding/DOS attacks, and other such things.
I'm sure that nothing is a perfect defence, but have a look at it, you may find it useful. I do suggest you have someone who knows about PHP to install this script, there are functions you may want to disable.