Greeting Card Script w/wo Notecard

Trying to make a greeting card that will open up and may/may not have a customizable notecard the purchaser can write. I've seen these and received a notecard one just the other day but was wanting to make a few.

The buyer can write a message on the notecard...when the recipient clicks the card, a notecard pops up with the buyer's message on it.

Would you use a door script with that and if so, how and where could I find one? And also, how to make that card customizable for the customer.

Thanks in advance for your time!

Thank you Lazink for being so helpful!!