Node overlap (webfm)

The attached image really sums it up, but here's the problem: Part of the module webfm floats under whatever node it runs into in the "middle" colum (left sidebar). This occurs in both IE and Firefox (though Firefox handles the webfm display properly to an extent, but once file names reach a certain length, the same problem occurs).

I'm looking for guidance on where to find/place code to fix this - I tried some simple things in webfm's provided css file, but nothing came of it.