function MakeArray(n) {
 
   this.length = n;
 
   for (var i = 1; i <=n; i++) {
 
     this[i] = 0;
   }
}
 
days = new MakeArray(7);
 
days[0] = "Sábado"
days[1] = "Domingo"
days[2] = "Lunes"
days[3] = "Martes"
days[4] = "Miércoles"
days[5] = "Jueves"
days[6] = "Viernes"
 
months = new MakeArray(12);
 
months[1] = "Enero" 
months[2] = "Febrero" 
months[3] = "Marzo" 
months[4] = "Abril" 
months[5] = "Mayo" 
months[6] = "Junio"
months[7] = "Julio" 
months[8] = "Agosto"
months[9] = "Septiembre" 
months[10] = "Octubre"
months[11] = "Noviembre"
months[12] = "Diciembre"
 
function compute(form) {
   var val1 = parseInt(form.day.value, 10)
 
   if ((val1 < 0) || (val1 > 31)) {
      alert("Day is out of range")
   }
 
   var val2 = parseInt(form.month.value, 10)
 
   if ((val2 < 0) || (val2 > 12)) {
      alert("Month is out of range")
   }
 
   var val2x = parseInt(form.month.value, 10)
 
   var val3 = parseInt(form.year.value, 10)
 
   if (val3 < 1900) {
      alert("You're that old!")
   }
 
   if (val2 == 1) {
      val2x = 13;
      val3 = val3-1
   }
 
   if (val2 == 2) {
      val2x = 14;
      val3 = val3-1
   }
 
   var val4 = parseInt(((val2x+1)*3)/5, 10)
   var val5 = parseInt(val3/4, 10)
   var val6 = parseInt(val3/100, 10)
   var val7 = parseInt(val3/400, 10)
   var val8 = val1+(val2x*2)+val4+val3+val5-val6+val7+2
   var val9 = parseInt(val8/7, 10)
   var val0 = val8-(val9*7)
 
   form.result1.value = months[val2]+" "+form.day.value +", "+form.year.value
   form.result2.value = days[val0]
}