function validarForma(forma){
	var formaValida = true, temp;
	var mensajeDeError = "Ocurrieron los siguientes errores-->\n";
	var i, elemento;
	for(i = 0; i < forma.elements.length; i ++){		
		if ((typeof forma.elements[i].requerido != "undefined") && (!forma.elements[i].disabled)){
			elemento = forma.elements[i];
			switch(elemento.requerido){
				case "texto" : 
					if(elemento.value == ""){
						mensajeDeError += elemento.nombre + " es requerido \n";
						formaValida = false;
					}
					break;
				case "numerico" :
					if (isNaN(parseFloat(elemento.value))){
						mensajeDeError += elemento.nombre + " debe ser numerico \n";
						formaValida = false;
					}
					break;
				case "fecha":
					temp = esFecha(elemento.value);
					if (temp != ""){
						mensajeDeError += elemento.nombre + ": " + temp + "\n";
						formaValida = false;						
					}
					break;
				case "hora":
					temp = esHora(elemento.value);
					if (temp != ""){
						mensajeDeError += elemento.nombre + ": " + temp + "\n";
						formaValida = false;						
					}
					break;
				case "select" :
					if (elemento.selectedIndex == elemento.indice || elemento.selectedIndex < 0){
						mensajeDeError += "No se seleccionó " + elemento.nombre + "\n";
						formaValida = false;
					}
					break;
			}
		}
	}		
	if (!formaValida){
		//alert(mensajeDeError);
		return false;
	}
	return true;
}

//----------------------------------------------------------------------------------------
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=0;
var maxYear=2100;
//-----------------------------------------------------------------------------------------
function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){           
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }    
    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 esFecha(dtStr){	
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=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){
		return "El formato debe ser mm/dd/aaaa o mm/dd/aa";
	}
	if (strMonth.length<1 || month<1 || month>12){
		return "mes no valido";		
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return "dia no valido";		
	}
	if (strYear.length > 4 || strYear.length == 3 || strYear.length == 1 || year==0 ){
		return "el año debe ser de 2 o 4 digitos";		
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return "no es un fecha valida";		
	}
return "";
}
//-----------------------------------------------------------------------------------------
function esHora(timeStr) {
// Checks if time is in HH:MM:SS AM/PM format.
// The seconds and AM/PM are optional.

var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;

var matchArray = timeStr.match(timePat);
if (matchArray == null) {
return "No es un formato valido para la hora";
}
hour = matchArray[1];
minute = matchArray[2];
second = matchArray[4];
ampm = matchArray[6];

if (second=="") { second = null; }
if (ampm=="") { ampm = null }

if (hour < 0  || hour > 23) {
return "Horas deben de estar en un rango de 1 a 12";
}
if (hour <= 12 && ampm == null) {
return "Especifique am o pm.";
}
if (minute<0 || minute > 59) {
return "El rango de minutos es de 0 a 59.";
}
if (second != null && (second < 0 || second > 59)) {
return "El rango de segundos es de 0 a 59";
}

return "";
}

//-----------------------------------------------------------------------------------------