Relative Link Filter

This is a simple filter module. It converts relative URLs to be
relative to their current location, not the Drupal home
directory. This eases the process of loading a directory of HTML
files into your Drupal database and mapping them to the same URLs they
had before Drupal.

For example, assume your Drupal is installed at
http://mysite.com/drupal/, and the page in question is available at
http://mysite.com/drupal/stories/index.html. Then the following
conversions will be done:

href="http://google.com/" => href="http://google.com/" (unchanged)
href="/index.html" => href="/index.html" (unchanged)
href="#anchor" => href="stories/index.html#anchor"
href="story-one.html" => href="stories/story-one.html"
src="http://www.google.com/intl/en/images/logo.gif" (unchanged)
src="/site-logo.gif" => src="/site-logo.gif" (unchanged)
src="images/logo.gif" => src="stories/images/logo.gif

The filter matches ' href="' or ' src="'. If your source doesn't have
a space before "href" or "src", or doesn't have a double-quote after
the equals sign, it won't do anything.

If you want a relative link to be unchanged, say ' hrefnot="' or '
srcnot="'. These will be changed to ' href="' and ' src="',
respectively, but will not be otherwise changed. This will make
relative links load relative to the Drupal directory, not the node's
directory.

hrefnot="#anchor" => href="#anchor"
hrefnot="story-one.html" => href="story-one.html"
srcnot="images/logo.gif" => src="images/logo.gif"

Note that including this filter in an input format will disable
caching for that input format.