<!--
function get_stays()
{
     var form   = document.rent;
     var arr_month  = new Array("nautilus", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
     
     var start1 = form.s1.selectedIndex;
     var start2 = form.s2.selectedIndex;
     var start3 = form.s3.selectedIndex;
     var start4 = form.s4.selectedIndex;
     var end1   = form.e1.selectedIndex;
     var end2   = form.e2.selectedIndex;
     var end3   = form.e3.selectedIndex;
     var end4   = form.e4.selectedIndex;
      
     year1  = eval(form.s1[start1].value);
     month1 = eval(form.s2[start2].value);
     day1   = eval(form.s3[start3].value);
     hour1  = eval(form.s4[start4].value);
     year2  = eval(form.e1[end1].value);
     month2 = eval(form.e2[end2].value);
     day2   = eval(form.e3[end3].value);
     hour2  = eval(form.e4[end4].value);
           
     //var start = new Date( arr_month[month1]+" "+day1+", "+year1);     
     //var end   = new Date( arr_month[month2]+" "+day2+", "+year2);
     var start = new Date( year1, month1-1, day1, hour1, 0, 0 );
     var end = new Date( year2, month2-1, day2, hour2, 0, 0 );
     
     var term = end.getTime() - start.getTime();
     var days = Math.floor( term / (1000*60*60));
      
     if( form.stay )
     	form.stay.value = days;
     return;
}

function changeY( year )
{
     var form   = document.rent;
     var tmp = form.s1.selectedIndex + year;
     form.end1.selectedIndex = tmp;
}

function changeM( mon )
{
     var form   = document.rent;
     var tmp = form.s2.selectedIndex + mon;
     if ( tmp == 13 ) tmp = 1;
     form.e2.selectedIndex = tmp;
}

function changeD()
{
     var form   = document.rent;
     
     var start1 = form.s1.selectedIndex;
     var start2 = form.s2.selectedIndex;
     var start3 = form.s3.selectedIndex;
      
     year1  = eval(form.s1[start1].value);
     month1 = eval(form.s2[start2].value);
     day1   = eval(form.s3[start3].value);
     
     if ( invalid_date(year1, month1, day1) == false)
     {
          alert (year1 + "년 " + month1 + "월 " + day1 + "일은 알맞는 날짜가 아닙니다.");
          return;
     }
     
     var nextDay = day1 + 1;
     var days = new Array(12);
     days[0] = 31; days[1] = 28;  days[2] = 31;  days[3] = 30;
     days[4] = 31; days[5] = 30;  days[6] = 31;  days[7] = 31;
     days[8] = 30; days[9] = 31; days[10] = 30; days[11] = 31; 
     
     if ((parseInt(year1) % 4) == 0) {
     	  days[1] = 29;
     	  if (((parseInt(year1) % 100) == 0) && (parseInt(year1) % 400) != 0)
     		days[1] = 28;
     }
     
     if (days[month1 - 1] < nextDay) {
     	  if ( month1 == 12 && day1 == 31 )
     	  {
     	       form.e1.selectedIndex = start1 + 1;
     	       form.e2.selectedIndex = 1;
     	       form.e3.selectedIndex = 1;
     	  }
     	  else
     	  {
     	       form.e2.selectedIndex = start2 + 1;
     	       form.e3.selectedIndex = 1;
     	  }     	
     }
     else
     {
          form.e3.selectedIndex = start3 + 1;
     }
     
     get_stays();
}

function invalid_date (year0, month0, day0)
{
     var days = new Array(12);
     days[0] = 31; days[1] = 28;  days[2] = 31;  days[3] = 30;
     days[4] = 31; days[5] = 30;  days[6] = 31;  days[7] = 31;
     days[8] = 30; days[9] = 31; days[10] = 30; days[11] = 31; 
     
     if ((parseInt(year0) % 4) == 0) {
     	days[1] = 29;
     	if (((parseInt(year0) % 100) == 0) && (parseInt(year0) % 400) != 0)
     		days[1] = 28;
     }
     if (days[month0 - 1] < day0) {
     	return false;
     }
     return true;
}
//-->