I'm using JSAS as the php server.
This is the first time I've tried using Safari so I'm at a loss as to what to look for. Any ideas?
safari has been known to have a lot of problems running on windows. I would recommend that you cut your losses and just use firefox or IE. If you really want to use safari, I would wait until they release another version.
If you are unable to get it to work, that will prevent you from testing your page, but you may be able to ask Safari/Mac users if it works ok for them. I assume that Safari/Windows is a rare enough combination that you are not out too much if you cannot support it.
Safari, being intended for the mac, will have some problems on windows. Cut your losses and have someone with a mac test for you, if your site works in IE, FFX, and Opera, then you should be good. With the possible exception of people using browsers that have no place on their operating system.