I'm trying to figure out how to create an overlay over the image to make the white text stand out
Try with a bootstrap modal check this link Bootstrap Modal
You coud use an rgba background.
[off-topic]Looks like you had shift down too soon here:-
<form method+"post" action="contact.php">
That should be =
thanks all, I dont know how to do the modal thing? Its using Bootstrap v2.3.7