I've been spending some time looking for a way to have the Left Panel closed when the Web Viewer opens on a Google Map. I found an addition to the statement that works - sometimes! The majic addition is the "output=embeded" at the end.
This works great on my iPad but it does not work at all on my Windows 7 machine or my iMac. Also, once I get it open on the iPad, I can't open the Left Panel. The little triangular thingy is not there.