Your Browser is Too Modern

What is it with websites in Israel and browsers whose names do not start with the words "Internet Explorer"? Though there is lots of web connectivity and presence, it seems that all of the web developers here were just never told that using Javascript that only works on IE is not a good way to leave your customers happy. Case in point: I just saw the following on the website of a Jerusalem Hotel while browsing with Flock/Firefox:

montefiore

In case you are reading in a text-only browser, It reads (my emphasis):

Error ! The current browser is either too old or too modern (usind DOM document structure).

This is followed by the header of a calendar, with no days showing, set to January 2000.

If it really was still January 2000, maybe I could understand (wait, no I wouldn’t – Netscape was still alive and kicking back then). But in 2008, to consciously choose not to support browsers used by a large percentage, if not majority of potential customers, simply boggles the mind.