Security warnings

I'm getting security warnings, even thought my ISP is forcing SSL. How can I change the URLs below to HTTPS or make them dynamic so they don't cause the SSL errors?

http://momsdemandaction.org/wp-admin/admin-ajax.php?callback=po_onsuccess&action=popover_selective_ajax&thefrom=https%3A%2F%2Fmomsdemandaction.org%2Fmth%2F&thereferrer=&active_popover=0&_=1362586474403

http://momsdemandaction.org/wp-content/plugins/popover/popoverincludes/css/fullbackground/images/opaque80.png

http://momsdemandaction.org/wp-content/plugins/popover/popoverincludes/css/fullbackground/images/opaque.png

http://momsdemandaction.org/wp-content/plugins/popover/popoverincludes/css/fullbackground/images/closemessagebland.png