WORST case scenario..

I just found out that you can't log in as a new user on my page.. What did I do now?!?!? A grey/blank page appears and it says "done" in the bottom left corner..

http://www.bysine.com

Roll up sleeves and see
https://www.zen-cart.com/tutorials/index.php?article=82

It seems that this might be the problem.. : Some kind of T-string error it says.. :unsure:

define('EMAIL_TEXT', 'With your account, you can now take part in the wonderful world of digital scrapbooking that I'm a part of. . "\n\n". 'Any products you choose to add to your online cart will remain there until you remove them, or check them out.' . "\n\n" . 'Please also remember that you can always review your history of purchases that you have made with me.' . "\n\n" . ' I hope you will have fun using my designs, and please don't hesitate to send me an e-mail with a link when you create something absolutely marvelous!! :D'. "\n\n" .
define('EMAIL_CONTACT', 'For help with any of my online services, please email me: <a href="mailto:' . STORE_OWNER_EMAIL_ADDRESS . '">'. STORE_OWNER_EMAIL_ADDRESS ." </a>\n\n");
define('EMAIL_GV_CLOSURE','Sincerely,' . "\n\n" . STORE_OWNER . "\nStore Owner\n\n". '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">'.HTTP_SERVER . DIR_WS_CATALOG ."</a>\n\n");

Can anyone tell me what is wrong with it?

It's from the welcome e-mail you get when signing up..

Ok.. So far so good.. Now I moved on from the completely blank grey screen to a HTTP 500 error..

I found out that I missed a ");" at the end.. But it still doesn't work properly.. Any tips?

But it still doesn't work properly
Can you be more specific?
Links directly to pages in issue

I can't link to it.. It's the page after you sign up as a member.. That means no one new can sign up.. :(

As I mentioned before instead of having a solid grey screen I now get a HTTP 500 error - whatever that means.. It wouldn't make sence copying the text in here because I have a Danish version of Vista.. But it's an ordinary "Page not found" kinda thing..