Stamp = new Date();
year = Stamp.getYear();
day="";
month="";
if (year < 2000) year = 1900 + year;
if(Stamp.getDate()<=10){
	day="0"+Stamp.getDate();
}
else day=Stamp.getDate();

if((Stamp.getMonth() + 1)<10){
	month="0"+(Stamp.getMonth() + 1);}
else month=(Stamp.getMonth() + 1);

var fechaHoy=day+"/"+month+"/"+year;


function check_date(field){
	
var checkstr = "0123456789";
var DateField = field;
var Datevalue = "";
var DateTemp = "";
var seperator = ".";
var day;
var month;
var year;
var leap = 0;
var err = 0;
var i;
   err = 0;
   DateValue = DateField.value;
   /* Delete all chars except 0..9 */
   for (i = 0; i < DateValue.length; i++) {
	  if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
	     DateTemp = DateTemp + DateValue.substr(i,1);
	  }
   }
   DateValue = DateTemp;
   /* Always change date to 8 digits - string*/
   /* if year is entered as 2-digit / always assume 20xx */
   if (DateValue.length == 6) {
      DateValue = DateValue.substr(0,4) + '20' + DateValue.substr(4,2); }
   if (DateValue.length != 8) {
      err = 19;}
   /* year is wrong if year = 0000 */
   year = DateValue.substr(4,4);
   if (year == 0) {
      err = 20;
   }
   /* Validation of month*/
   month = DateValue.substr(2,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }
   /* Validation of day*/
   day = DateValue.substr(0,2);
   if (day < 1) {
     err = 22;
   }
   /* Validation leap-year / february / day */
   if ((year % 4 == 0) || (year % 100 == 0) || (year % 400 == 0)) {
      leap = 1;
   }
   if ((month == 2) && (leap == 1) && (day > 29)) {
      err = 23;
   }
   if ((month == 2) && (leap != 1) && (day > 28)) {
      err = 24;
   }
   /* Validation of other months */
   if ((day > 31) && ((month == "01") || (month == "03") || (month == "05") || (month == "07") || (month == "08") || (month == "10") || (month == "12"))) {
      err = 25;
   }
   if ((day > 30) && ((month == "04") || (month == "06") || (month == "09") || (month == "11"))) {
      err = 26;
   }
   /* if 00 ist entered, no error, deleting the entry */
   if ((day == 0) && (month == 0) && (year == 00)) {
      err = 0; day = ""; month = ""; year = ""; seperator = "";
   }
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      DateField.value = day + seperator + month + seperator + year;
   }
   /* Error-message if err != 0 */
   else {
      alert("La fecha es Incorecta!");
      DateField.select();
	  DateField.focus();
   }
}
//--------------------------------------


<!-- Begin
var max_units = 200; // quantities in excess of max_units all have the same unit price
var currency = "$"; // currency sign used in 'formatMessage()'
// Edit this function to reflect your discount prices! 
function getDiscountPrice(tipoTamal) {
// Note: It is important to work your way down from max to min amounts!

if (tipoTamal == "A") return 9.50;
if (tipoTamal == "B") return 8.00;
if (tipoTamal == "C") return 10.50;
}
function getNumberOfUnits() {
var units = Math.round(document.pedidos.tamal_A.value)*(100/100) * getDiscountPrice('A')+
			Math.round(document.pedidos.tamal_AR.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_B.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_C.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_D.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_E.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_F.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_G.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_H.value)*(100/100) * getDiscountPrice('A')+
            Math.round(document.pedidos.tamal_I.value)*(100/100) * getDiscountPrice('B')+
            Math.round(document.pedidos.tamal_J.value)*(100/100) * getDiscountPrice('B')+
            Math.round(document.pedidos.tamal_K.value)*(100/100) * getDiscountPrice('B')+
            Math.round(document.pedidos.tamal_L.value)*(100/100) * getDiscountPrice('B')+
            Math.round(document.pedidos.tamal_M.value)*(100/100) * getDiscountPrice('B')+
            Math.round(document.pedidos.tamal_N.value)*(100/100) * getDiscountPrice('B')+
            Math.round(document.pedidos.tamal_O.value)*(100/100) * getDiscountPrice('B')+
            Math.round(document.pedidos.tamal_P.value)*(100/100) * getDiscountPrice('B')+ 
            Math.round(document.pedidos.tamal_Q.value)*(100/100) * getDiscountPrice('B')+  
            Math.round(document.pedidos.tamal_R.value)*(100/100) * getDiscountPrice('C')+  
            Math.round(document.pedidos.tamal_S.value)*(100/100) * getDiscountPrice('C');  

           
return (units == "") ? 0 : units;
}

function getNumberOfTamals() {
var units = Math.round(document.pedidos.tamal_A.value)*(100/100) +
			Math.round(document.pedidos.tamal_AR.value)*(100/100) +
            Math.round(document.pedidos.tamal_B.value)*(100/100) +
            Math.round(document.pedidos.tamal_C.value)*(100/100) +
            Math.round(document.pedidos.tamal_D.value)*(100/100) +
            Math.round(document.pedidos.tamal_E.value)*(100/100) +
            Math.round(document.pedidos.tamal_F.value)*(100/100) +
            Math.round(document.pedidos.tamal_G.value)*(100/100) +
            Math.round(document.pedidos.tamal_H.value)*(100/100) +
            Math.round(document.pedidos.tamal_I.value)*(100/100) +
            Math.round(document.pedidos.tamal_J.value)*(100/100) +
            Math.round(document.pedidos.tamal_K.value)*(100/100) +
            Math.round(document.pedidos.tamal_L.value)*(100/100) +
            Math.round(document.pedidos.tamal_M.value)*(100/100) +
            Math.round(document.pedidos.tamal_N.value)*(100/100) +
            Math.round(document.pedidos.tamal_O.value)*(100/100) +
            Math.round(document.pedidos.tamal_P.value)*(100/100) + 
            Math.round(document.pedidos.tamal_Q.value)*(100/100) +  
            Math.round(document.pedidos.tamal_R.value)*(100/100) +  
            Math.round(document.pedidos.tamal_S.value)*(100/100) ;  

           
return (units == "") ? 0 : units;
}

function showResult(NoTamals,result) {
// adjust the following line if result must popup somewhere else
document.pedidos.responsN.value = NoTamals;	
document.pedidos.respons.value = result;	
}

function formatMessage(units, unit_price) {
//return units + " * " + currency + formatPrice(unit_price) + " = " + currency + formatPrice(units * unit_price);
return " = " + currency + formatPrice(units) ;
}

// AltUnits (alternate units): add extra units to reach minimum for next discount price
function getAltUnits(units) {
var discount_price = getDiscountPrice(units);
if (units < max_units) do { units++ } while (discount_price == getDiscountPrice(units));
return units;
}

function findPrice() {
var units = getNumberOfUnits();
//var alt_units = getAltUnits(units);
//var alt_unit_price = getDiscountPrice(alt_units);
var unit_price=5;
var result;
var NoTamals=getNumberOfTamals();

result = formatMessage(units, unit_price); 

showResult(NoTamals,result);
}


function formatPrice(value) {
var result= Math.floor(value) + ".";
var cents = 100 * (value-Math.floor(value)) + 0.5;
result += Math.floor(cents / 10);
result += Math.floor(cents % 10);
return result;
}

function filterNonNumeric(field) {
var result = new String();
var numbers = "0123456789";
var chars = field.value.split(""); // create array 
for (i = 0; i < chars.length; i++) {
if (numbers.indexOf(chars[i]) != -1) result += chars[i];
}
if (field.value != result) field.value = result;
}

//  End -->