plasmid prep with G+ bacteria

[kannan at kuhub.cc.ukans.edu]

Does anyone out there know how to purify plasmids from Gram + bacteria--
i want purify a plasmid from drug resistant Staph. sp. to see if the plasmid is 
responsible for imparting resistance.  The Promega miniprep kit doesn't work.  
i also tried to treat the cells with Lysostaphin for 15 min. and then did a 
wizard miniprep.  it didn't work either.  i always see a smear on the gel.
anyinput on this sue would be of great help.
Thanks.
Kannan Thiru, University of Kansas.