[Javascript] Modern usage

[moseley at hank.org (Bill Moseley)]

I'm updating a site and I'm questioning some of the javascript.  I'm
quite new to javascript, but I'm wondering how much of this might be
for very old browsers, and how much is still required today.

For example:

I'm seeing usage like 

    if (document.images) {

which from googling seems like that's testing for IE3's lack of
support. Do I need to worry about IE3 users today?

I also see

    document.all

instead of getElementByID.  What percent of browsers don't support
that DOM method?

The page also is using ypSlideoutMenu from 2001.  Anyone familiar
with this?  Would you consider it acceptable javascript?

http://cvs.sourceforge.net/viewcvs.py/ypslideoutmenus/ypSlideOutMenus/ypSlideOutMenus.js?rev=1.2&view=auto

http://ypslideoutmenus.sourceforge.net/demo/index.html


-- 
Bill Moseley
moseley@xxxxxxxx