I signed into OpenStreetMap a few days ago, and found it to be a marvelous project. I'm starting to contribute by increasing the details of the maps of my surrounding area, Águas Claras and Brasília, the Brazilian capital, and adding some suburbs in areas that either I can go with my GPS receiver or that I know very well.

I'd like to edit with Merkaartor, but I cannot download the Yahoo background imagery; I don't know if it's a limitation on the app or if I'm doing something wrong. I don't quite like JOSM, as it is not too fast on my machine, so, for the time being, I'm going to use Potlatch and, as my skills improve, I'll make some more fine-grained mapping with Merkaartor.

What is the correct way of making bridges with Potlatch? Can I just put a stretch of road, mark it with bridge=yes and drag it over the main road?