//Validación
//tipo = todo: validamos fecha, bases legales y fecha
//tipo = fecha: solo validamos la fecha
function validar(){
  
  //Validamos la fecha
  var miFecha = $F('dia')  + '/' + $F('mes') + '/' + $F('anio');
  var fechaCorrecta = isDate(miFecha);
  if (!fechaCorrecta) return false;
  
  //Si la fecha es correcta validamos el resto de campos 
  
   //el email debe ser correcto y no vacío
   var email = $F('email');
   var re = new RegExp (/^(?:[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}[a-zA-Z0-9]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\]))$/); 
   
   if (email == ''){
   
      alert ('Por favor, indique su correo electrónico');
      $('email').focus();
      return false;
      
   } 
   
   else {
      //Comprobamos que el email es corecto
      if (!email.match(re)) {
         alert ('Por favor, revise su correo electrónico');
         $('email').focus();             
         return false;
      }
   }
       
   //Debe aceptar las bases legales
   var basesLegales = $F('basesLegales');
   if (basesLegales != 'aceptadas'){
   
      alert ('Para poder participar debe aceptar las bases legales');
      $('basesLegales').focus();
      return false;
   
   }
   
   return true;
   
   
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 * DHTML date validation script for dd/mm/yyyy. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1;
var maxYear=2009;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("El formato de la fecha debe ser dd/mm/aaaa (día / mes / año )")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Por favor, revise el mes")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Por favor, revise el día")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("En el campo Año debe introducir un número comprendido entre " + minYear + " y " + maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Por favor, revise la fecha")
		return false
	}
return true
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function gestionaValorAnio(){
   
   valor = $F('anio'); 
   
   if (valor == '') this.value= '0000'; 
   
   longitud = valor.length; 
   while (longitud < 4)
   {  
      $('anio').value = '0' + $F('anio'); 
      longitud = $F('anio').length; 
   }
   
   
}