Zip code entry in flash

I have a project where a landing page requires the user to enter their zip code to see a product. It then goes to a PHP page with these samples. It is supposed to go and send this zip code and get a resulting name of the area in the upper part of the screen. I got as far as it being able to go to the right page, but it doesnt change the location. the code I have thus car is this:

on (release) {
var Setzip;
getURL(“http://www.mysite.com/product/promo.htm?depId=1&pgId=100&devicePrId=26161”, “1”, “POST”);
}

Any ideas? thanks!