function setDay(formname, dayname, dayvalue) {

    eval("document.forms['"+formname+"']."+dayname+".selectedIndex="+dayvalue);

  }



  // yearvalue must AC

  function setMonth(formname, dayname, monthname, yearname, monthvalue) {

    var maxday = 1;

    var oldDay = eval("document.forms['"+formname+"']."+dayname+".selectedIndex");

    if(monthvalue == 1 || monthvalue == 3 || monthvalue == 5 ||

       monthvalue == 7 || monthvalue == 8 || monthvalue == 10 ||

       monthvalue == 12) {

      maxday = 31;

    }

    else

    if(monthvalue == 4 || monthvalue == 6 ||

       monthvalue == 9 || monthvalue == 11) {

      maxday = 30;

    }

    else

    if(monthvalue == 2) {

      var yearvalue = eval("document.forms['"+formname+"']."+yearname+".value");

		yearvalue=yearvalue-543;

	  // check for leap year

      if(yearvalue%4 == 0 && (yearvalue%100 != 0 || yearvalue%400 == 0)) {

        maxday = 29; 

      }

      else {

        maxday = 28;

      }

    }

    else { // unspecified

      maxday = 31;

    }



    eval("document.forms['"+formname+"']."+dayname+".length=maxday");

    var doption = new Option("", 0);

    eval("document.forms['"+formname+"']."+dayname+".options[0]=doption");

    for(var i=1;i<=maxday;i++) {

      var option = new Option(i, i);

      eval("document.forms['"+formname+"']."+dayname+".options[i]=option");

    }

    eval("document.forms['"+formname+"']."+monthname+".selectedIndex=monthvalue");

    // change day to unspecified

    var minday = Math.min(maxday, oldDay);

    setDay(formname, dayname, minday);

  }



  // yearvalue is index selected of yeareoption 

  function setYear(formname, dayname, monthname, yearname, yearvalue) {

    var today = new Date();



    var oldMonth = eval("document.forms['"+formname+"']."+monthname+".selectedIndex");

    setMonth(formname, dayname, monthname, yearname, oldMonth);

  }



  function initDate(formname, dayname, monthname, yearname) {

    var today = new Date();

    var yearvalue = today.getFullYear();

	

    var option0 = new Option("", 0);

    var option1 = new Option("มกราคม", 1);

    var option2 = new Option("กุมภาพันธ์", 2);

    var option3 = new Option("มีนาคม", 3);

    var option4 = new Option("เมษายน", 4);

    var option5 = new Option("พฤษภาคม", 5);

    var option6 = new Option("มิถุนายน", 6);

    var option7 = new Option("กรกฎาคม", 7);

    var option8 = new Option("สิงหาคม", 8);

    var option9 = new Option("กันยายน", 9);

    var option10 = new Option("ตุลาคม", 10);

    var option11 = new Option("พฤศจิกายน", 11);

    var option12 = new Option("ธันวาคม", 12);



    // month

    eval("document.forms['"+formname+"']."+monthname+".length=13");

    for(var i=0;i<13;i++) {

      eval("document.forms['"+formname+"']."+monthname+".options[i]=option"+i);

    }



    // day

    var doption = new Option("     ", 0);

    eval("document.forms['"+formname+"']."+dayname+".options[0]=doption");

    for(var i=1;i<=31;i++) {

      var option = new Option(i, i);

      eval("document.forms['"+formname+"']."+dayname+".options[i]=option");

    }



    // once init is called, set all month and day values to default (unspecified)

    eval("document.forms['"+formname+"']."+dayname+".selectedIndex=1");

    eval("document.forms['"+formname+"']."+monthname+".selectedIndex=1");

    //eval("document.forms['"+formname+"']."+yearname+".value=2543");

  }



   function initDate2(formname, dayname, monthname, yearname) {

    var today = new Date();

    var yearvalue = today.getFullYear();

	var monthvalue =  today.getMonth();

	var dayvalue =  today.getDate();

    var option1 = new Option("มกราคม", 1);

    var option2 = new Option("กุมภาพันธ์", 2);

    var option3 = new Option("มีนาคม", 3);

    var option4 = new Option("เมษายน", 4);

    var option5 = new Option("พฤษภาคม", 5);

    var option6 = new Option("มิถุนายน", 6);

    var option7 = new Option("กรกฎาคม", 7);

    var option8 = new Option("สิงหาคม", 8);

    var option9 = new Option("กันยายน", 9);

    var option10 = new Option("ตุลาคม", 10);

    var option11 = new Option("พฤศจิกายน", 11);

    var option12 = new Option("ธันวาคม", 12);



    // month

    eval("document.forms['"+formname+"']."+monthname+".length=12");

    for(var i=1;i<=12;i++) {

      eval("document.forms['"+formname+"']."+monthname+".options[i-1]=option"+i);

    }



    // day

    for(var i=1;i<=31;i++) {

      var option = new Option(i, i);

      eval("document.forms['"+formname+"']."+dayname+".options[i-1]=option");

    }



    // once init is called, set all month and day values to default (unspecified)

    eval("document.forms['"+formname+"']."+dayname+".selectedIndex="+(dayvalue-1));

    eval("document.forms['"+formname+"']."+monthname+".selectedIndex="+monthvalue);

     // default current year

  }



  function monthChange(formname, dayname, monthname, yearname) {

    var value = eval("document.forms['"+formname+"']."+monthname+".selectedIndex");

	setMonth(formname, dayname, monthname, yearname, value);

  }



  function yearChange(formname, dayname, monthname, yearname) {

    var value = eval("document.forms['"+formname+"']."+yearname+".value");

	setYear(formname, dayname, monthname, yearname, value);

  }