Ahh, I had it backwards in what you were doing. I thought you were at work and connecting to your home, but sounds like it's the opposite. Still not exactly sure how things are setup, but one way to browse is,
from Finder > Go menu > Connect to Server > Browse.
This will generally bring up a Finder window selecting the Network. From here you'll see a list of Work Groups. You should be able to traverse the folders as need be. I've only done this for local networks at home though so not sure how much of it applies to what you're doing. Rather than browsing you can also put in a IP address, though it sounds like that didn't work for you.
You can also try changing the Mac's workgroup name to your work's workgroup name, which may help it find it. To do this,
Applications > Utilities > Directory Access > highlight SMB/CIFS > Configure > Type in name