Data In A Textarea Box

I am trying to get a form that uses aspmail to work. The form works, submits, sends, does all that it is supposed to EXCEPT: that when the user is returned to the form page after being shown a required field message; All the fields the user had filled in are still filled in, except for the textarea field which is now blank.

As this field is there for potential customers to request detailed information about what they are interested in, it would no doubt be very frustrating to have to keep filling this info back in. Is there any way I can force the textarea field to hold on to its data?