stripslashes(do_shortcode($options['dialogtext']));
You have the stripslashes in the wrong place, this is probably why contact form 7 doesn't work, I know it fixed my gravity forms shortcode problem.
do_shortcode(stripslashes($options['dialogtext']));
As well you are using wp_specialchars (which is deprecated) you should be using esc_html
Finally you should register your scripts before enqueuing them so it gives other developers a chance to deregister them, i.e. the fancy box script as this is called by many plugins and can cause conflicts. <-- this last one is my 2 cents. Thanks!
