Changing from subfolders to sub pages

I have changed all the way i have made my pages of late, i was using dynamic pages which were created as such www.domain.com/keyword im now making more normal html pages such as www.domain.com/page1.html this is fine and im gettig spidered however the sub folder set up has thousands of pages indexed in Yahoo but when i click a page i get a page not found error. Is there anyway i can set up an htaccess so that all users and bots which find the sub folders are redirected to the .html index


thanks

 

I would set it up like this:

domain.com/keyword/keyword.html

This helps your serps in two ways, first your mentioning your keyword twice!

But second you could take it a step further and use two similar keywords at the same time.