Website just lost a lot of functions

Hi everyone,

My website was working fine and then all of a sudden it just seemed to have stopped running jQuery or javascript or something.

The lightboxes suddenly don’t work anymore, and some drop-down options on the main menu are not showing (the ones that require SQL query).

At first I thought it was the lightbox plugin went wrong, but I tried three different ones and it just doesn’t make any difference, it won’t pop up any on clicks or anything. It also doesn’t work ANYWHERE on the website. There were no apparent changes made between the time that it was working fine in August and the time that it stopped (it was before the latest update).

What do you think would have happened?

Here is an example: https://www.emirates-enterprise.com/chrp-ad/
The link at the bottom of the page is supposed to pop a form in a lightbox, it doesn’t work anymore.

Any advice? I am NOT a fully trained html programmer, but I have taught myself a thing or two due to necessity and self-exploration, so please be patient and a bit elaborative when it comes to asking about specific code edits or such.

Thanks,

Sam