I am not sure how to write a OnClick JavaScript custom close button on case object.

When the user clicks on this custom button, the following fields need to be updated with the given values.

Fields on case object:
Product Family = Unknown        
Product Model = Unknown
Problem Code = Non-Technical
Resolution Code = Spam
Status = Closed
Resolution Description = Spam
Account Name (lookup field) =  Unclassified Customer – Minnetonka 

Also need to associate the contact to the account; Unclassified Customer – Minnetonka


I appreciate the help!

Beth