I have a keyboard with little buttons on top for opening my browser,
email client, changing my volume level, etc...
I want to reassign the email button to take me to gmail. Can anyone
tell me how to remap these keys?

hey what type of keyboard? anything written on it?

Logisys kb606bk

Did you do this:

Multi-Media Keyboard User's Guide Step:

1. www.microsoft.com/hardware/keyboard/download.asp 
2.After enter Web, "Select your keyboard" Select "Internet keyboard" 
3. At "Select your operating system" Select "Windows 98" 
4. At "Select your operating system language" Select"English" 
5. Click "Download Now" to download the file: ITP2_21Engallmsi.exe;
(file size 10MB)

Afterwards, I would imagine that there would be some sort of
configuration menu within Control Panel>Keyboard

Just a guess really.