Hi Donna,
i am also a 'switcher' to mac (Imac G4 in this case) and still got those "windows fear spasms" when too many windows pop up while browsing (fearing that it would stall as it would in Windows)But here u can click apple Q and quit.
I would suggest you to upgrade to Panther (u could buy in a secondhand online store for 50$ or so), or Tiger, because in Safari Browser u can block popups already and could download ' Pit Helmet'. :http://www.versiontracker.com/dyn/mo...158&vid=167068
With that one u can block ad's, popups popunders and nasty cookies.
It tends to be shareware and every now and then it asks to register.
But you can press: Skip and then just click the "register screen" away.
(though be aware that with blocking, many webpages might not always fully load or show all of its content well, (like some images i noticed)) Mmm, nasty that most sites don't have for example plain HTML without the nasty trackingsoftware!!!

Sanne