CFDatefield not working in FF

This has never happened to me: something actually works in IE and NOT in FF!

Current version of FF is 3.06. The CFdatefield input does not function in any Mozilla-based browser and throws a Javascript error: Error: "_f is undefined"
"Source File:http://localhost:8500/CFIDE/scripts/ajax/package/cfcalendar.js"

This points to a line in the JS:

"ColdFusion.Calendar.setUpCalendar=function(_6,_7,_8,_9,_a,_b,_c){
var _d=ColdFusion.DOM.getElement(_6+_b+"_cf_button",_b);
var _e=ColdFusion.DOM.getElement(_6,_b);
var _f=null;
var _10=null;
if(_e.value!=""){
_f=_e.value;
_10=_f.split("/");
}
"
Where the last two lines seem to have a problem.

Can anyone help? This appears to be either a new issue (with a new release of FF maybe) or it's a local issue with my code (everything is possible I guess :).

Robert