firewall icon shows but I am able to download

[bottomsupiowa]

I'm actually having no problem downloading songs from others, but the icon at the bottom left shows the globe with a brick wall in front of it, however,I have my firewall shut off. I have a Mac with Tiger on it, and I use Airport Xtreme for the internet. Is this firewall preventing others from getting music from me? I haven't seen anything uploading yet. I tried to find where you add Gnutella in the allow to firewall, but there is no such thing there. I guess my main question is can other people upload my music if this brick wall icon is showing, and if not, how do I make it so that brick wall goes away.