How to remove parent slug from child page's permalink?

How can I remove parent slug from child page's permalink? This may not be Atahualpa specific, but I can't figure out how to do it... Perhaps there is a plugin that might work?

I use pages (ie. not posts) that are setup as children of a parent page. In my menu bar navigation they appear as

/services/page1.html
/services/page2.html
/services/page3.html

Where what I want is:
/page1.html
/page2.html
/page3.html

(I'm using the "html-on-pages" plugin to add the .html since I'm moving this site over from another server and this is the site structure it currently has.)

Is there anyway to accomplish what I'm looking to do? I've considered NOT using the parent/child option, but I can't have all the actual page names in my navigation, there are way too many and too long. I NEED to be able to use the drop down feature, but I would prefer NOT to have the extra parent name in the url.