function esDigito(sChr){
	var sCod = sChr.charCodeAt(0);
	return ((sCod > 47) && (sCod < 58));
}
function valSep(oTxt){
	var bOk = false;
	bOk = bOk || ((oTxt.value.charAt(2) == "-") && (oTxt.value.charAt(5) == "-"));
	bOk = bOk || ((oTxt.value.charAt(2) == "/") && (oTxt.value.charAt(5) == "/"));
	return bOk;
}
function finMes(oTxt){
	var nMes = parseInt(oTxt.value.substr(0, 2), 10);
	var nRes = 0;
	switch (nMes){
		case 1: nRes = 31; break;
		case 2: nRes = 29; break;
		case 3: nRes = 31; break;
		case 4: nRes = 30; break;
		case 5: nRes = 31; break;
		case 6: nRes = 30; break;
		case 7: nRes = 31; break;
		case 8: nRes = 31; break;
		case 9: nRes = 30; break;
		case 10: nRes = 31; break;
		case 11: nRes = 30; break;
		case 12: nRes = 31; break;
	}
	return nRes;
}
function valDia(oTxt){
	var bOk = false;
	var nDia = parseInt(oTxt.value.substr(3, 2), 10);
	bOk = bOk || ((nDia >= 1) && (nDia <= finMes(oTxt)));
	return bOk;
}
function valMes(oTxt){
	var bOk = false;
	var nMes = parseInt(oTxt.value.substr(0, 2), 10);
	bOk = bOk || ((nMes >= 1) && (nMes <= 12));
	return bOk;
}
function valAno(oTxt){
	var bOk = true;	
	var nAno = oTxt.value.substr(6);
	bOk = bOk && ((nAno.length == 2) || (nAno.length == 4));
	if (bOk){
		for (var i = 0; i < nAno.length; i++){
			bOk = bOk && esDigito(nAno.charAt(i));
		}
	}
	return bOk;
}
function validarFechaIn(oTxt){
	var bOk = true;
	if (oTxt.value != ""){
		bOk = bOk && (valAno(oTxt));
		bOk = bOk && (valMes(oTxt));
		bOk = bOk && (valDia(oTxt));
		bOk = bOk && (valSep(oTxt));
		if (!bOk&&oTxt.name==document.formulario.requeridoCheckIn.name){
			alert("Please enter a valid date (format mm/dd/yyyy)");
			document.formulario.requeridoCheckIn.value="";
			document.formulario.requeridoCheckIn.focus();
		}
		if (!bOk&&oTxt.name==document.formulario.requeridoCheckOut.name){
			alert("Please enter a valid date (format mm/dd/yyyy)");
			document.formulario.requeridoCheckOut.value="";
			document.formulario.requeridoCheckOut.focus();
		}
		if (bOk&&oTxt.name==document.formulario.requeridoCheckOut.name){
			var dE = parseInt(document.formulario.requeridoCheckIn.value.substr(3, 2), 10);
			var mE = parseInt(document.formulario.requeridoCheckIn.value.substr(0, 2), 10);
			var aE = document.formulario.requeridoCheckIn.value.substr(6);
			
			var dS = parseInt(document.formulario.requeridoCheckOut.value.substr(3, 2), 10);
			var mS = parseInt(document.formulario.requeridoCheckOut.value.substr(0, 2), 10);
			var aS = document.formulario.requeridoCheckOut.value.substr(6);
			
			if ((aS<aE)||(mS<mE&&aS==aE)||(dS<=dE && mS==mE && aS==aE)){
				alert("Check Out date must be after the Check In date");
				document.formulario.requeridoCheckOut.value="";
				document.formulario.requeridoCheckOut.focus();
			}
		}
	}
}