Java applet and Javascript type problem

[Interdit]

Hello,

I'm using a Java applet which has a public byte[] GetRawPictureData() method which returns in fact a picture.
My goal is to convert that array to a base64 encoded string on the javascript side.

When I call it in Javascript under Mozilla it returns an object, so all is working fine but under IE it returns "unknown":
alert(typeof appletElement.GetRawPictureData());

What could I do to debug more or investigate this issue ?

Thanks for your help,

Interdit