CiviCRM WP SSL doesn't work

In March I started this forum post due to a conflict with SSL between CiviCRM & WP: http://forum.civicrm.org/index.php/topic,28043.0.html. For the past few months the work around we've used has been just enabling the whole WP site on SSL and not using the CiviCRM SSL option. However, with the newest release of Firefox, as it is with IE, if there is insecure content on a page, it won't display it. This could be a link, or any number of things within the content that is hard to control. What we want to accomplish is enabling SSL only on pages that we use CiviCRM, specifically pages that take payments. Attached is a screenshot of what happens when I try enable SSL on a site that has SSL enabled. How can we get this to work?