function astro(birth)
{
 if (birth!='')
 { var tmpstr;
  var bstr;
  var mm;
  var yy;
  var dd;
  var birthmonth;
  tmpstr=birth.split(' ')
  bstr=tmpstr[0]
  tmpstr=bstr.split('-')
  yy=(tmpstr[0]*1)
  mm=(tmpstr[1]*1)
  dd=(tmpstr[2]*1)
  switch(mm){
  case 1 :
  if(dd>=21){return('水瓶座');}
  else{return('魔羯座');}
  break;
  case 2 :
  if(dd>=20){return('双鱼座');}
  else{return('水瓶座');}
  break;
  case 3 :
  if(dd>=21){return('白羊座');}
  else{return('双鱼座');}
  break;
  case 4 :
  if(dd>=21){return('金牛座');}
  else{return('白羊座');}
  break;
  case 5 :
  if(dd>=22){return('双子座');}
  else{return('金牛座');}
  break;
  case 6 :
  if(dd>=22){return('巨蟹座');}
  else{return('双子座');}
  break;
  case 7 :
  if(dd>=23){return('狮子座');}
  else{return('巨蟹座');}
  break;
  case 8 :
  if(dd>=24){return('处女座');}
  else{return('狮子座');}
  break;
  case 9 :
  if(dd>=24){return('天秤座');}
  else{return('处女座');}
  break;
  case 10 :
  if(dd>=24){return('天蝎座');}
  else{return('天秤座');}
  break;
  case 11 :
  if(dd>=23){return('射手座');}
  else{return('天蝎座');}
  break;
  case 12 :
  if(dd>=22){return('魔羯座');}
  else{return('射手座');}
  break;
  default : return('');
}
 }else{return('');}
}

function change_birth(theform) {
	var _astro = astro(theform['year'].value+'-'+theform['month'].value+'-'+theform['day'].value);
	if (_astro != '') {
		theform['constellation'].value = _astro;
	}
}