// valida fechas (dd/mm/aaaa - dd/mm/aa)

function separaFecha (laFecha)
{
 dias = [];
 meses = [];
 anos = [];
  
 var elementos = laFecha.split(";");
 
 for (var i=0, len=elementos.length; i<len; ++i)
 {
  if (elementos[i] != undefined) 
  { 
   a=check_date(elementos[i]);
   if (!a)
   {
    elementos.splice(i,1); 
    i--;
   }
   else
   {
    var tmp = elementos[i].split("/");
    dias [i] = parseInt(tmp[0],10);
    meses [i] = parseInt(tmp[1],10);
    anos [i] = tmp[2];
   }
  }
 }
  
 return elementos.length;
}

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 = field;
   for (i = 0; i < DateValue.length; i++) {
	  if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
	     DateTemp = DateTemp + DateValue.substr(i,1);
	  }
   }
   DateValue = DateTemp;
   if (DateValue.length == 6) {
      DateValue = DateValue.substr(0,4) + '20' + DateValue.substr(4,2); }
   if (DateValue.length != 8) {
      err = 19;}
   year = DateValue.substr(4,4);
   if (year == 0) {
      err = 20;
   }
   month = DateValue.substr(2,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }
   day = DateValue.substr(0,2);
   if (day < 1) {
     err = 22;
   }
   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;
   }
   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 ((day == 0) && (month == 0) && (year == 00)) {
      err = 99;
   }
   if (err == 0) {
      return true;
   }
   else {
      return false;
   }
}