Zarniwoop

Maybe this plugin could be useful for you.

You can now download Version 0.2 which fixes some javascript bugs with IE and I hope it works (it should, at least with IE 6).
I’m pretty new to javascript — in fact, I never used it before — so the cross-browser part is mostly “try and error”.

@1: The placement is due to some limitations of the plugin API. If you really want it otherwhere, you’ll have to add a link manually to e.g. wp-admin/edit-form-advanced.php
@3: I don’t know why, but normally it should open a smaller popup window. Maybe the little javascript does not work correctly on every browser but I will look at it tomorrow.

I tested your example with 1.2-mingus and it works properly.
Sorry, but I did it only after correcting a bug (or is it a feature?) in the Markdown-Plugin (see this post).

Change the following lines at the bottom of the plugin to do Markdown _before_ WP-texturize (!= textile) and it should work.
add_filter(‘the_content’, ‘Markdown’, 6);
add_filter(‘the_excerpt’, ‘Markdown’, 6);
There is also a typo in _DoAnchors_reference_callback:
if ( isset( $g_titles[$link_id] ) ) {
(the ‘s’ in $g_titles has been forgotten.)

Thx,
the priority-trick helped me to get it to work within normal parameters.
Why doesn’t the plugin have this by default?