1063 script problem

We have a custom website and shopping cart developed by a programmer who is no longer able to continue freelancing. It is written in PHP and MySQL. We have a few projects, but our most immediate need concerns an error that causes intermittent blank orders and an error message to display in the main cart and mini "view items" cart. The error is known. We are hosted by GoDaddy, and this is what their support team said: Dear Sir/Madam, The errors you are receivng are entirely scripting related. Your script is writing to the browser prior to setting the cookie and this is what is generating the error. The cookie set is part of the header information and since the header has previously been written, you are receiving the errors on your page. Correcting your script will eliminate the errors. This is a partial example of the error message--- Warning: mysql_result(): supplied argument is not a valid MySQL result resource...