As of today, my webshop appears to have stopped working for some reason.

www.mercuriuscollective.org
When you clikc "Enter Website" you get a blank page.
The exact same happens when you enter the webshop through it's URL: www.mercuriuscollective.org/tmcshop
No error messages what so ever.

I do get an error message when I try to access my admin page:
www.mercuriuscollective.org/tmcshop/admin

It says: "Deprecated: Function ereg() is deprecated in /home/mercuriu/public_html/tmcshop/includes/classes/db/mysql/query_factory.php on line 177"

If anyone knows what could have happened and/or how to solve this, please do let me know. I'm desperate with two new publications coming up and the pre-orders opened!