I run an Virtuemart store that sells art from many artists. Artists are saved as manufacturers. I use the database function to prepopulate a custom field checkbox list from the manufacturers table in Virtuemart.
I them use a form on each product page to allow a visitor to subscribe to our Art Alerts list and the Artist's Name/Manufacturer Name is included in a hidden field within the form. When a person subscribes to the list the custom field is updated correctly and can be seen in the admin area.
If a person visits a second product, by a different artist, and they then choose to be updated about this artist as well their subscription is updated with the new artist but the original artist is no longer checked. How can I keep the original artist checked within the subscription and merely add the new artist as checked as well?
