.AddField Not working

I just purchased this product so I'm new to this.

No matter what I do, I can't get AddField to work.
I followed the online documentation and read all the posts but still no luck.

This is my code:
//Add event handlers.
iu.addEventListener("UploadFileCountChange", "ImageUploader_UploadFileCountChange");
iu.addEventListener("BeforeUpload", "beforeUploadHandler");
iu.fullPageLoadListenerName = "fullPageLoad";

function beforeUploadHandler() {

var galleryid = document.getElementById("HiddenFieldGallerId").value;
alert(galleryid); <-- This alert works fine

getImageUploader("ImageUploader").AddField("GalleryId", document.getElementById("HiddenFieldGallerId").value);
getImageUploader("ImageUploader").Send();
alert(galleryid);<-- This alert never fires

}

On my upload.aspx page I have:

Dim test As String = Request.Form("GalleryId")

I get test = Nothing


When I put an alert in the javascript after getImageUploader("ImageUploader").AddField("GalleryId", document.getElementById("HiddenFieldGallerId").value); it never fires off

What am I doing wrong??