i'm not sure about settings of IE on MAC. you can though ask mac_moghul for a precise reply.
though in IE, you can go to tools > internet options > connections tab.
and select there, "always dial my default connection" or "dial when network is not present" assuming she do not connects to internet via network as well.
this is based on assumption that the base looks same for both win and macs for IE.
i'm not on netscape, or i wuld have helped u better, but at least can tell you that there are settings (talking about outlook) that you can adjust again selecting never dial to internet / connection if machine isnt on-line.
i think you have to go to edit > preferences in netscape.
as if someone is using Netscape Collabra or similar, he can be able to assist u in Netscape more. but i have given u general idea. though u can try that on IE and afterwards on NS as well
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"