var daysArr = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var dayArr = "sday";
var monthArr = "sho";
var yearArr = "sev";

function Set_Day(a, b){//OK

	var month = 1;
	var year = 1;
	var data = a.value;
	if(data > 12){// ev hivassal
		month = eval("document.adminForm." + monthArr + b + ".selectedIndex");
		month = eval("document.adminForm." + monthArr + b  + ".options[month].value");
		year = data;
	}
	else{// honap hivassal
		month = data;
		year = eval("document.adminForm." + yearArr + b + ".selectedIndex");
		year = eval("document.adminForm." + yearArr + b + ".options[year].value");
	}
	var days = daysArr[month-1];
	if(year % 4 == 0 && month == 2)days += 1;

	eval("document.adminForm." + dayArr + b + ".options.length = 0");
	for(i=0;i<days;i++)
	{
			eval("document.adminForm." + dayArr + b + ".options[i] = new Option(i+1, i+1)");
	}
}