Okay, here's the situation.

I'm creating a website specifically for mobile browsers for my company. I'm uploading it to a test server on a network inside of the network firewall. I'm then connecting my Curve via WiFi, which is inside the same network. The problem is I can't see the website I've uploaded, or any other sites on the internal network.

It seems the blackberry is using its own DNS server rather than the default server for the wireless network. Is there some property I can change to fix this problem?

The Blackberry has four different modes for the Web Browser (three if your BB doesn't have WiFi). Assuming your company has a BES, select "Blackberry Browser" as the browser mode for the bookmark to your internal test site. This will route all connections through your BES (your web server will see the connections sourced internally via the BES). If you have a WiFi-enabled BB and the WiFi network has access to the web server (e.g., no firewalls blocking it), then you could also select "WiFi Browser" mode.

I'm connecting to my company's network over the curve's WiFi connection, which is inside the company firewall. My browser only has 2 settings, WiFi Browser and tzones, which I have WiFi Browser set.

I just started understanding the problem. My company uses the windows hosts file to point this URL at an internal IP address (just found this out). The server can't be accessed via IP directly, because it looks at the URL to decide what site to go to.

Is there any blackberry equivalent to a hosts file that I can easily use?

Not that I am aware of.

Be sure that you are actively in a wifi browser mode by going to Bookmarks and selecting the "hotspot login" one. After that is completed, try to load your page again.