Safari Mac can't access web site that Windows can

None of my Macs can access the site http://cards.123greetings.com . I get Can't Find Server messages in both Safari and Firefox. (Clearing caches doesn't help)
cards.123greetings.com is part of a large free card site that did a major upgrade in October. It still renders correctly on a PC running Windows XP Home which runs on the same network as the Macs, so it's not an isp problem.
Since both Macs (G4 iBook running 10.3, MacBook running 10.4) have the same Can't Find Server problem with both Safari and Firefox, it appears that some setting in the Macs themselves is causing this.
Any help or insight would really be appreciated - Thanks!

A big Thank You to Mulder for letting me know that you can access the site (with Mac Safari I presume) - That's good news.
The bad news: I still can't access the site.
The problem affects two separate computers and four browers. Taking your advice, I repaired permissions and logged in as a new account on both machines. Unfortunately that didn't work.
I next tried accessing the site on the MacBook through Parallels running Windows XP Home. The site came up fine using Internet Explorer.
Then I realized that Parallels operates with a different ip address. So I went back on the Mac using a proxy, and the site came right up.
It now seems that the ip addresses of both computers are being blocked at some level. I want to thank Mulder for replying and virtually ruling out that it might be a Safari issue. I'm now "off topic" and will no longer post in this section. But I'm also over my head... If anyone has advice about how to proceed now, I'd truly appreciate it.
Thanks!

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Safari Mac can't access web site that Windows can

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