[targetplanet]

I am developing an online store in flash and
I am trying to change the qnty of an item when the customer presses the add to cart button, But I am just getting NAN no matter what I try. the origanal # being pull from a database.
It doesn't recognize the number as a number.... the variable, pot_qnty, is a text field, but I have tried using a set veriable just for subtracting the qnty #, but it still tuns out NAN
I have even tried the Number() function
NAN

the current code I have on the button is:
stock = Math.floor(pot_qnty);
pot_qnty = stock - 1;
if (pot_qnty == 0) {
pot_qnty = "sold out";
}


the site URL
http://www.mainepottersmarket.com/mpm.htm
(still in dev.)
any thoughts?
thanks
russ