Damn I need those ones in ai format. I don't even know how to open ps files. I assume their postscript? Some sort of vector format. Having the ones in ai format will mean I can remove the white backgrounds.
the file you mentioned, on vectorlib
is an illustrator one, let me guess you're using windowns and IE, this couple of things change the extension while saving (thank's microsoft).
just change back the extension, and voila perfect illustrator file
