Query String in HTML Fields

Hi,

I manage to populate fields dynamically with query string, but how can i populate an HTML field.

This is my link to the embedded gravity form:
http://www.blueafrica.co.za/site-04-sc/gravity/?fn=William

And I would like to add a HTML field to the form that says:
Dear fn ..... Where the value for fn is taken from the url, in this case "William"

Is this possible?

Many thanks

Schalk