Lightbox form doesn't open at times in Safari

Sometimes my lightbox does not open in safari on this page only. I'm using the lightbox feature for other pages but sometimes this one doesn't do anything when clicking on the button (image) unless I refresh the page. Whether or not it's working, I get the attached error message with an Inspect Element. Ideas?

It seems that there are conflicts on your page which cause the form to not work at some times. Based on screenshot it also seems that the code from the form is trying to contact the form within the iframe, but that the message ends up being sent to an iframe on your own server.

Do you have any plugin / iframe that you call at times (or all the time) on that page only - which could be the one that the form is contacting. If you know which one it is it would help us find it and help you avoid the same from happening.

Really the only thing that's different about this page is that there are two jotforms. One general contact form on the right and this one in a lightbox. Could that be it?

I tried your form, and I got an error using Chrome:

However, it  only reproduced once. I think it's a problem between the Light Box code and your JQuery libraries. Here's how to deal with jQuery conflicts. http://learn.jquery.com/using-jquery-core/avoid-conflicts-other-libraries/