var CurDate = new Date();
 var CurMonth = Number(CurDate.getMonth())+1;
 var CurDay = Number(CurDate.getDate());
 document.air._month1.selectedIndex = CurMonth-1;
 document.air._date1.selectedIndex = CurDay;
 document.air._month2.selectedIndex = CurMonth-1;
 document.air._date2.selectedIndex = CurDay+1;