HELP please URGENT

Hi,

I have changed some code in my application and it now wont work, I can not figure out what I have done wrong.

I need some urgent help as i can not print out invoices and my shop is open. The URL is

https://creator.zoho.com/mrcomputer/mrcomputer-biz/#Form:Print_Control

If you can help PLEASE. I would be grateful

Nigel