the beginning of a week?

should be Sunday, isn't it???
but on my mac (ical) it's Monday, which seems very odd to me.
previously, i just hacked into /Library/Widgets/iCal.wdgt/Calendar.js
to make it begin from Sunday, but in OS 10.6, i found that it's
hard to make this hack, i think the code is badly written,
this logic spreads all over the javascript, can't find a vital point to hit.

finally i found where to set this stuffs.
in System Preferences => Language and Text => Formats
you can change the first day of a week. just change it to Sunday...

finally!! cong!