[RCU] Integrating Roundcube login into WordPress page

I have a text widget in WordPress that logs into squirrel mail and redirects the user to their inbox. I’ve been looking for a way to do with is RoundCube, but haven’t found anything so far.

Wordpress and round cube are installed in separate folders, of course, but are currently on the same server. However, a solution that is not dependent on localhost would be best, of course.

Has anyone done this? I don’t want to duplicate effort.

And I don’t want this to be tied to Wordpress, really. I just want a widget to appear in the column with a login and password field someone can fill in, hit “login” and be taken to Roundcube.