how to secure only a few directories and left the rest of the web unsecure

[Francisco Javier Martínez Martínez]

Hello. Anyone knows how to secure only a few directories and left the rest of the web unsecure = only accesible with http:// nor with https://. That is due to we are using relatives direcctions in our pages (not the whole URL path), and the problem is that if you are in a http page and navigate to a https page, everything is ok, but if you from this https page goes to a http clicking over a link, as this link is relative, you still are in https navigation mode, this forces to write the pages with the whole URL path, and there is a lot.   I had securized a few directories with the 'SSRequireSSL' directive in the httpd.conf, but I am wondering if is possible to make the same from the .htaccess (I belive that this could be relationed with my first question). Thanks in advance. Bye and Sorry for my English