Hm, seems to resize properly in Safari for me, though Camino cropped it at the bottom, but as other said, it's likely a margin issue, and those seem to be exceedingly difficult to pin down. I've found that getting a window to open to the exact dimensions of an enclosed image is near impossible, since depending on the browser you get a different window size depending on the user's settings.
For example, on this page on your site:
http://www.identity-arts.com/04home.htm
If my bookmarks bar is turned off and my status bar (at the bottom) is on, the window is just the right size for the image. If I turn both off, there's a stripe at the bottom. If I turn both on, the image is cropped vertically.
There's no way around this, since you can't control the user's setting, and window size in Safari is based on measurements below the toolbar--not including bookmark bar, status bar, or scrollbars.
So, your only option is to make the window a little bigger to accommodate people with everything on, and deal with borders for people who don't.
I'm also of the opinion that with the exception of maybe popup help window type things (like a small floating help window that doesn't close the page you were on), resizing the user's browser window is invasive and very annoying. It assumes your site is the only one the user is going to look at in this browsing session, which is almost never the case--they're surfing along happily, clickthrough a link to your site, and suddenly they've got this little tiny browser window that doesn't fix itself when they go back, and they now have to manually resize it back to what they wanted.
Quick way to annoy readers if you ask me, and really unnecessary.
This is getting off topic, and I don't want to sound like I'm insulting your design, since it visually looks quite nice, but I do have an honest question: If you're specifically designing for Safari, which has decent modern standards support, why are you using a single image map for all content?
That's sort of a 90s-era relic of being overly attached to your site looking exactly the same on every computer it is viewed on, including funky broken browsers like Netscap 4, when that goes against the fundamental concept of the web. Designing the site as more flexible HTML/XHTML code that looks proper in Safari, and accepting that there will be some minor differences depending on user preferences (which is ok--what if they have trouble reading small text so scale up the font?) seems a lot more logical.
The only reason for a strict image map is exact design layout even on crummy ancient browsers, but since you're targeting Safari anyway, that doesn't matter.
