I've posted most of the information I have on the post dated January 20th 2009. The Pantaleon Zuber (b. 1818) you are searching for, seems to be the same one I have on my family tree.
I have mentioned Pantaleon's two elder brothers, Niklaus (who also emigrated to the US) and Martin. I have also mentioned Pantaleon's father Jakob (b. 1770) and his grand-father Urs.
I have no sign (yet) of a Dorothei Dorst Zuber.
I don't think you'll find much information concerning Swiss genealogy on line. All communes have their local archives, almost nothing is centralized and hardly any of it has been scanned and put online.
If you need any assistance, please let me know. I live in Geneva and Günsberg is a two and a half hour drive away. It's quite easy for me to go and check out any information you may need.
You can contact me at olivier.zuber(at)hotmail.com is you need any more specific information.