I`ve tested the javascript date picker in the availability form and it works fine for me!
tested on WinXP sp2 IE version 6.0.2900.2180
also tested on IE 5.5 and 5.01 from
http://www.quirksmode.org/browsers/multipleie.html
and no problems there!
I had to play with $var_calendar_box_style options (added width: 140px; height: 140px;) to get it to look right but thats all.
btw this is on a localhost but that shouldnt matter should it?
anyone else had problems?
keep up the good work

Martin