There was a post about this on the old sifr forum in 2008, but there was never an answer. If a user clicks something on the page before the page fully loads, a javascript error occurs:
"J" is null or not an object
sifr.js
Code: 0
URI: sifr.js
Line: 17 Char: 19389
I am using sifr 3 r436.
You can see the error at this page if you try to go to the next month of the calendar too quickly. (Click the arrow a bunch.)
http://www.goyikes.com/calendar_events.asp
Has anyone ever solved this problem?