Problem with php and mysql

Hi everyone, One of our customers has written a php application that we are hosting. Basically, there is a province/state table which populates a combo box. When the form containing this combo box is submitted, the information is added into the database. The problem is that when nothing is selected from the combo box, it adds a number which seems to be random in the database, rather than the province/state ID which it references from the province table. Obviously there are many methods of avoiding this such as javascript to make sure something is selected, or even giving the combo box a default value, but I was wondering if anyone knew why the database itself isn't catching the error (foreign key violation) and accepting the data. Any ideas? Thanks in advance for any help, Kevin ----------------------------------- Kevin Demers Technical/Customer Support Internet Access - WORLDWIDE 3 East Main Street Welland, ON Canada L3B 3W4 (905) 714-1400 (800) 560-4560 kevind@iaw.on.ca www.iaw.on.ca