[dev] open_calendar.js

[duck]

there is an problem with cvs from 14.3. (i upgraded now from cvs 26.2.) 
becouse the feilds in the forms are now named like "feildyear" isted of 
"feild[year]", so I changed all occurences of

'[year]' to 'year'
'[month]' to 'month'
'[day]' to 'day'

for example

 document.getElementById(target + '[day]').value);

becomes

 document.getElementById(target + 'day').value);

now works
Duck