function daysinmonth(lnMonth,lnYear) {
  var dt1, cmn1, cmn2, dtt, lflag, dycnt, lmn

  lmn = lnMonth-1
  dt1 = new Date(lnYear,lmn,1)
  cmn1 = dt1.getMonth()
  dtt=dt1.getTime()+2332800000
  lflag = true
  dycnt=28
  while (lflag) {
     dtt = dtt + 86400000
     dt1.setTime(dtt)
     cmn2 = dt1.getMonth()
     if (cmn1!=cmn2) {
        lflag = false }
     else {dycnt = dycnt + 1}}
  if (dycnt > 31) {dycnt = 31}
  return dycnt
}

function setdays(sobjname, datemode){
  var dobj = eval(sobjname + "d")
  var mobj = eval(sobjname + "m")
  var yobj = eval(sobjname + "y")
  var hobj = eval(sobjname)
  var monthdays = daysinmonth(mobj.options[mobj.selectedIndex].value,yobj.options[yobj.selectedIndex].value)
  var selectdays = dobj.length
  var curdy = dobj.options[dobj.selectedIndex].value

  if (curdy.length==1) {curdy = "0"+curdy}
    var curmn = mobj.options[mobj.selectedIndex].value
  if (curmn.length==1) {curmn = "0"+curmn}
    var curyr = yobj.options[yobj.selectedIndex].value
  if (selectdays > monthdays) {
   for (var dlp=selectdays; dlp > monthdays; dlp--) {
       dobj.options[dlp-1] = null }}
  else if (monthdays > selectdays) {
   for (var dlp=selectdays; dlp < monthdays; dlp++) {
       dobj.options[dlp] = new Option(dlp+1,dlp+1) }}
  if (curdy > monthdays) {
   dobj.options[monthdays-1].selected = true
   curdy = monthdays }
  if (datemode==1) {
   var curdate = curmn+"/"+curdy+"/"+curyr }
  else if (datemode==2) {
   var curdate = curdy+"/"+curmn+"/"+curyr }
  else if (datemode==3) {
   var curdate = curyr+curmn+curdy }
  else if (datemode==4) {
   var cdate = new Date(curyr,curmn-1,curdy)
   var curdate = cdate.toGMTString() }
   hobj.value = curdate

}