ok heres one to tax the zen cart cleaver cloggs! :)

I have a client who would like the following.

They sell a product that comes with engraving. the customer can imput the text on the plaque. I have set up a text box for the customer to enter but heres the problem. If the customer buys more than 1 product can i have it so more than one text box appears. e.g.

how many units would you like?
1
2
3
4
etc

then if 4 is selected 4 text box's appear below for the user to imput the text into.

any ideas?