// funcion que comprueba que se han seleccionado parametros
	function validar(form, parametros, parametroscal) {
		var nparametros = 0;
		for (var i=0; i<form.elements.length; i++) {			
			if (form.elements[i].checked) {
				nparametros++;
			}
		}
		if (!nparametros)
			alert(" no se ha seleccionado ningun parametro para la consulta");
		else if(nparametros > 15) 
			alert(" no se pueden consultar mas de 15 parametros a la vez ");
			else 
				form.submit();
	}
	
	
	function checkbox_tot(v) {
		var total = 0;
			if (v.length == undefined && v.checked){
			return 1;
		} else {
			for (var i = 0 ; i < v.length ; i++){
				if ( v[i].checked){ 
				 total++;
				}
			}
		}				
		return total;
	}
	// Parsea en ingles para poder comparar
	function returnDate(datestr) {
		isplit = datestr.indexOf('/');
		sDay = datestr.substring(0, isplit);
		monthsplit = isplit + 1;
		isplit = datestr.indexOf('/', monthsplit);
		sMonth = datestr.substring(sDay.length + 1, isplit);
		sYear = datestr.substring(isplit+1);
		fecha = new Date();
		//cambio a ingles
		fecha.setDate(sDay);
		fecha.setMonth(sMonth);
		fecha.setYear(sYear);
		Date.parse(fecha);
		return fecha;
	}

	
// Original:  Mike Welagen (welagenm@hotmail.com) 
// This script and many more are available free online at 
// The JavaScript Source!! http://javascript.internet.com 


function checkdate(objName) {
var datefield = objName;
if ( chkdate(objName) == false ) {
	//datefield.select();
	//datefield.focus();
	return false;
} else {
	return true;
}
}
function chkdate(objName) {
//var strDatestyle = "US"; //United States date style
var strDatestyle = "EU";  //European date style
var strDate;
var strDateArray;
var strDay;
var strMonth;
var strYear;
var intday;
var intMonth;
var intYear;
var booFound = false;
var datefield = objName;
var strSeparatorArray = new Array("-"," ","/",".");
var intElementNr;
var err = 0;
var strMonthArray = new Array(12);
strMonthArray[0] = "Ene";
strMonthArray[1] = "Feb";
strMonthArray[2] = "Mar";
strMonthArray[3] = "Abr";
strMonthArray[4] = "May";
strMonthArray[5] = "Jun";
strMonthArray[6] = "Jul";
strMonthArray[7] = "Ago";
strMonthArray[8] = "Sep";
strMonthArray[9] = "Oct";
strMonthArray[10] = "Nov";
strMonthArray[11] = "Dic";
strDate = datefield.value;
//fix Jorge
strLength = objName.value.length;
if ( strLength < 8 || strLength > 10 ){
	return false;
}
if (strDate.length < 1) {
	return true;
}
for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
strDateArray = strDate.split(strSeparatorArray[intElementNr]);
if (strDateArray.length != 3) {
err = 1;
return false;
}
else {
strDay = strDateArray[0];
strMonth = strDateArray[1];
strYear = strDateArray[2];
}
booFound = true;
   }
}
if (booFound == false) {
if (strDate.length>5) {
strDay = strDate.substr(0, 2);
strMonth = strDate.substr(2, 2);
strYear = strDate.substr(4);
   }
}
if (strYear.length == 2) {
strYear = '20' + strYear;
}
// US style
if (strDatestyle == "US") {
strTemp = strDay;
strDay = strMonth;
strMonth = strTemp;
}
intday = parseInt(strDay, 10);
if (isNaN(intday)) {
err = 2;
return false;
}
intMonth = parseInt(strMonth, 10);
if (isNaN(intMonth)) {
for (i = 0;i<12;i++) {
if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
intMonth = i+1;
strMonth = strMonthArray[i];
i = 12;
   }
}
if (isNaN(intMonth)) {
err = 3;
return false;
   }
}
intYear = parseInt(strYear, 10);
if (isNaN(intYear)) {
err = 4;
return false;
}
if (intMonth>12 || intMonth<1) {
err = 5;
return false;
}
if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
err = 6;
return false;
}
if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
err = 7;
return false;
}
if (intMonth == 2) {
if (intday < 1) {
err = 8;
return false;
}
if (LeapYear(intYear) == true) {
if (intday > 29) {
err = 9;
return false;
}
}
else {
if (intday > 28) {
err = 10;
return false;
}
}
}
if (strDatestyle == "US") {
datefield.value = strMonthArray[intMonth-1] + " " + intday+" " + strYear;
}
else {//EUR
datefield.value = intday + "/" + intMonth + "/" + strYear;
}
return true;
}
function LeapYear(intYear) {
	if (intYear % 100 == 0) {
	if (intYear % 400 == 0) { return true; }
}
else {
if ((intYear % 4) == 0) { return true; }
}
return false;
}
//comparar como //
function parseFix(datestr){
	isplit = datestr.indexOf('/');
	sDay = datestr.substring(0, isplit);
	monthsplit = isplit + 1;
	isplit = datestr.indexOf('/', monthsplit);
	sMonth = datestr.substring(sDay.length + 1, isplit);
	sYear = datestr.substring(isplit+1);
 return sMonth + "/" + sDay + "/" + sYear;	
}
//Compara dos fechas 
function compararFechas(from, to, max_diff) {
	from_value_diff = parseFix(from);
	to_value_diff = parseFix(to);
		
	if (Date.parse(from_value_diff) <= Date.parse(to_value_diff)) {	
		diff =( Date.parse(to_value_diff) - Date.parse(from_value_diff) )/(1000*60*60*24);
		if (diff > max_diff){
			return false;
		} else {
			return true;
		}
	} else {
		return true;
   }
}