Thanks everyone for your help with the last problem. I feel really stupid for misspelling 'function'.

I have another question, I need to get the serial numbers for all the appliances, but at the moment I only have options for up to 4 appliances. I have 4 text boxes for the serial numbers, but if someone only has one appliance they may get confused, and if someone has 5 appliances it won't accomodate them. Is there any way to adjust the number of boxes according to the number of appliances they select?

thanks =)