[jQuery] ui datepicker error onSelect:

[jQuery] ui datepicker error onSelect:


For the life of me I cannot get this to work:
Jquery 1.2.6
and ui 1.6r2 and tried with 1.5.3 stable
$('input.tdate').datepicker({onSelect:function(dateText){alert
(dateText);} });
Keeps throwing when calendar date is clicked:
inst is undefined
_get()()jquery-u....3.min.js (line 198)
_changeFirstDay()()jquery-u....3.min.js (line 146)
onclick()checklist# (line 1)
[Break on this error] return chars;},_get:function(inst,name){...onth
();inst.endYear=date.getFullYear();}
line one of /checklist is just the doctype..
help plz