selDate = (last_date != '') ? last_date : this.date;
var _monarr = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
if (((this.year % 4 == 0) && (this.year % 100 != 0)) || (this.year % 400 == 0)) _monarr[1] = 29;
var _max_day_number = this.firstDay + _monarr[this.month];
for (j = 0; j < _max_day_number; j++)
{}
OK, i add some code into js calendar file whith is in plugins folder of CI.
I think this is better than old.
