function Empty(value) {
    var pattern=new RegExp("^[ ]*$");
	if (value.match) {
		return value.match(pattern) || value.length==0;
	} else {
		return false;
	}
}

// isInteger: devuelve verdero si value es un entero
function isInteger(value) {
    var pattern=new RegExp("^[0-9]+$");
    return value.match(pattern);
}

// isDouble: devuelve verdero si value es un double
function isDouble(value) {
    var pattern=new RegExp("^[0-9]+(\\.[0-9]+){0,1}$");
    return value.match(pattern);
}

// isMoney: devuelve verdadero si un valor es tipo moneda
function isMoney(value, isEnglish) {
	if (isEnglish) {
	    var pattern=new RegExp("^[0-9]+(\\.[0-9]+){0,1}$");
	    return value.match(pattern);
	} else {
	    var pattern=new RegExp("^[0-9]+(,[0-9]+){0,1}$");
	    return value.match(pattern);
	}
}

// isMoney2: devuelve verdadero o falso si es tipo moneda
function isMoney2(value)
{
	var pattern= new RegExp("^([0-9]+|[0-9]{1,3}(,[0-9]{3})*)(\.[0-9]{2})?$");
	return value.match(pattern);
}

// isMail: devuelve verdadero si value es una direccion de correo valida
function isMail(value) {
    var pattern=new RegExp("^([a-zA-Z0-9_\\-]+\\.{0,1})+@([a-zA-Z0-9_\\-]+\\.)+[a-zA-Z0-9_\\-]+$");
    return value.match(pattern);
}

// isWeb: devuelve verdadero si value es una direccion de web válida
function isWeb(value) {
	var pattern=new RegExp ("http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?");
	return value.match(pattern);
}

// isDate: devuelve verdadero si value es una fecha valida en formato dd/mm/aaaa
function isDate(value) {
	var arr = value.explode("/");
	var day = arr[0];
	var month = arr[1];
	var year = arr[2];
	month = month - 1;
	var dDate = new Date(year, month, day);
	return ((day==dDate.getDate()) && (month==dDate.getMonth()) && (year==dDate.getFullYear())); 
	
    var pattern1=new RegExp("^(0[0-9]|[1-2][0-9]|30|31)/(0[13-9]|1[0-2])/[1-9][0-9][0-9][0-9]");
    var pattern2=new RegExp("^(0[0-9]|[1-2][0-9])/(0[0-9]|1[0-2])/[1-9][0-9][0-9][0-9]");

    if (value.match(pattern1) || value.match(pattern2)) {
        if (parseInt(value.substr(6,4))%4!=0 && parseInt(value.substr(3,2))==2 && parseInt(value.substr(0,2))==29) {
            return false;
        } else return true;
    } else return false;
}

// isAlpha: devuelve verdadero si la cadena contiene solo caracteres alfabeticos o espacios
function isAlpha(value) {
	var pattern=new RegExp("^[a-zA-Z\\s]+$");
    return value.match(pattern);
}

// isRut: devuelve verdadero si value es valido para el modulo 11
function isRut(value) {
    var pattern=new RegExp("^(([0-9]{1,2}\\.[0-9]{3}\\.[0-9]{3})|([0-9]{7,8}))\\-([0-9K])$", "i");
    var pattern_point=new RegExp("\\.", "g");
    var pattern_dv=new RegExp("([0-9]+)\\-([0-9K])", "i");

    value=Trim(value);
    if (value.match(pattern)) {
        value=value.replace(pattern_point, "");
        if (value.match(pattern_dv)) {
            number=new String(RegExp.$1);
            dv=new String(RegExp.$2);
            sum = 0;
            mul = 2;
            for (i = number.length - 1 ; i >= 0; i--) {
                sum += number.charAt(i) * mul;
                mul == 7 ? mul = 2:mul++;
            }
            rest = sum % 11;
            if (rest == 1) dvr = 'K';
            else if (rest == 0) dvr = '0';
            else  {
                dvr = 11-rest;
            }
            return dvr==dv.toUpperCase();

        }
    }
}

// LTrim: Quita espacios en blanco a la izquerda de una cadena
function LTrim(value) {
    var pattern=new RegExp("^\\s+", "g")
    return value.replace(pattern, "");
}

// RTrim: Quita espacios en blanco a la derecha de una cadena
function RTrim(value) {
    var pattern=new RegExp("\\s+$", "g")
    return value.replace(pattern, "");
}

// Trim: Quita espacios en blanco a la derecha y a la izquierda de una cadena
function Trim(value) {
    return RTrim(LTrim(value));
}

// Str2Date: Convierte un valor string en formato dd/mm/aaaa a fecha
function Str2Date(sDate) {

	if (!isDate(sDate)) return;
	sDate = new String(sDate);

	aDate = new Array();
	aDate = sDate.explode('/');

	return new Date(aDate[2], aDate[1]-1, aDate[0], 0, 0,0 );

}

// DateCmp(A, B): Compara dos fechas devuelve 0=iguales, 1=A>B, -1=B>A
function DateCmp(dDateA, dDateB) {

	if (dDateA.getTime() == dDateB.getTime()) return 0;
	if (dDateA.getTime() > dDateB.getTime()) return 1;
	else return -1;

}

// DayAdd(dDate, iDays): Suma (o resta) dias a una fecha dada
function DayAdd(dDate, iDays) {
	dDate.setTime(dDate.getTime()+iDays*24*60*60*1000);
	return dDate;
}

// isTime: devuelve verdadero si value es una hora valida en formato hh:mm:ss
function isTime(value) {
    var pattern=new RegExp("^[ 0-2][0-9]:[0-5][0-9]$");
    return value.match(pattern);
}

// isSelected: devuelve verdadero si un select tiene elementos seleccionados (multiselect) o 
// si es la opcion seleccionada no es la primera (select normal)
function isSelected (obj) {
	if (obj.multiple) {
		// Es un Select Mutliple
		for (i=0;i<obj.options.length;i++) {
			if (obj.options[i].selected) return true;
		}	
		return false;
	} else if (obj.multiple==false) {	
		// Es un Select Simple
		return obj.selectedIndex!=0;

	} else {
		// Es un Option
		var i;

        for (i=0;i<obj.length;i++) {
            if (obj[i].checked) return true;
        }       
		return false;
	}
}	

// MonthAdd: nos permite sumar meses a una fecha 
// dDat es la fecha y iMonths la cantidad de meses a sumar
function MonthAdd(dDat, iMonths) {
	var dDate=new Date(dDat);
	var month=dDate.getMonth()+iMonths;
	if (month>11) {
		dDate.setYear(dDate.getYear()+parseInt((month+1)/12));
		month=(month+1)%12-1;
	}
	dDate.setMonth(month);
	return dDate;	  						   	     			   			
}

// Repeat: devuelve la cadena sValue repetida iLenght veces.   
function Repeat(sValue, iLenght) {
	var sText='';   			
	for(i=1;i<=iLenght;i++) {
		sText=sText+sValue;
	}   			   
	return sText;
}

// LPad, rellena por la izquierda svalue con el caracter sChar hasta un largo iLenght.
function LPad(sValue, sChar, iLenght) {
	sValue=String(sValue);
	sValue=Repeat(sChar, iLenght-sValue.length)+sValue;
	return sValue;   			   			   			
}

// isURI, devuelve verdadero si value es una uri valida, falso en caso contrario
function isURI(value) {	  
	var pattern=new RegExp("^([a-z]*://){0,1}([a-zA-Z0-9_\\-]+\\.)+[a-zA-Z0-9_\\-]+(:[0-9]+)*$");
	return value.match(pattern);
}

function StuffDate(value){
	   var arr = value.explode("/");
	   if (arr.length != 3){
		return(value);
	   }
       day   = value.explode("/")[0];
       month = value.explode("/")[1];
       year  = value.explode("/")[2];
       
       day   = value.explode("/")[0];
       month = value.explode("/")[1];
       year  = value.explode("/")[2];
       return(LPad(day, '0', 2) + '/' + LPad(month, '0', 2) + '/' + LPad(year, '0', 4));
}

function Date2ISO(dDate){
	var isoDate;
	isoDate = dDate.getFullYear() + LPad(dDate.getMonth() + 1, '0', 2) + LPad(dDate.getDate(), '0', 2);
	return isoDate;
}

function Str2Float(value){
	return parseFloat(value);
}

function setCookie(name, value, expire) { 
   document.cookie = name + "=" + escape(value) 
   + ((expire == null) ? "" : ("; expires=" + expire.toGMTString())) 
} 

function getCookie(Name) { 
   var search = Name + "=" 
   if (document.cookie.length > 0) { // if there are any cookies 
      offset = document.cookie.indexOf(search) 
      if (offset != -1) { // if cookie exists 
         offset += search.length 
         // set index of beginning of value 
         end = document.cookie.indexOf(";", offset) 
         // set index of end of cookie value 
         if (end == -1) 
            end = document.cookie.length 
         return unescape(document.cookie.substring(offset, end)) 
      } 
   } 
} 


function deleteCookie(name,path,domain) { 
    if (getCookie(name)) document.cookie = name + "=" + 
       ( (path) ? ";path=" + path : "") + 
       ( (domain) ? ";domain=" + domain : "") + 
       ";expires=Thu, 01-Jan-70 00:00:01 GMT"; 
} 


function registerCookie(cookieName,cookieValue) { 
   var today = new Date() 
   var expires = new Date() 
   expires.setTime(today.getTime() + 1000*60*60*24*365) 
   setCookie(cookieName, cookieValue, expires) 

}

function isAllDigit(value){
   numberString = new String("0123456789");
   arrVal = value.explode("");
   for(var i=0;i<value.length;i++){
   	if(numberString.indexOf(arrVal[i]) == -1){
   		return false;
   	}
   }
   return true;
}


function validaLargo(obj,maxNumCarac){
	comentario = obj.value;
	var caracOcupados = maxNumCarac - comentario.length;
	if(comentario.length > maxNumCarac){
		obj.value = comentario.substring(0,maxNumCarac);
	}
}

function trim(cad)
{return Trim(cad);}

function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57))
	return false;
	return true;
}
function isFloatKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
	if(charCode!=46)
	{
		if (charCode > 31 && (charCode < 48 || charCode > 57))
		return false;
	}
	return true;
}
function isAlphaKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode==39 || charCode == 34))
	return false;
	return true;
}
function isAlpha(value) {
	var pattern=new RegExp("^[a-zA-Z\\s]+$");
    return value.match(pattern);
}


var dateFormat = function () {
	var	token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
		timezoneClip = /[^-+\dA-Z]/g,
		pad = function (val, len) {
			val = String(val);
			len = len || 2;
			while (val.length < len) val = "0" + val;
			return val;
		};

	// Regexes and supporting functions are cached through closure
	return function (date, mask, utc) {
		var dF = dateFormat;

		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
		if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
			mask = date;
			date = undefined;
		}

		// Passing date through Date applies Date.parse, if necessary
		date = date ? new Date(date) : new Date;
		if (isNaN(date)) throw SyntaxError("invalid date");

		mask = String(dF.masks[mask] || mask || dF.masks["default"]);

		// Allow setting the utc argument via the mask
		if (mask.slice(0, 4) == "UTC:") {
			mask = mask.slice(4);
			utc = true;
		}

		var	_ = utc ? "getUTC" : "get",
			d = date[_ + "Date"](),
			D = date[_ + "Day"](),
			m = date[_ + "Month"](),
			y = date[_ + "FullYear"](),
			H = date[_ + "Hours"](),
			M = date[_ + "Minutes"](),
			s = date[_ + "Seconds"](),
			L = date[_ + "Milliseconds"](),
			o = utc ? 0 : date.getTimezoneOffset(),
			flags = {
				d:    d,
				dd:   pad(d),
				ddd:  dF.i18n.dayNames[D],
				dddd: dF.i18n.dayNames[D + 7],
				m:    m + 1,
				mm:   pad(m + 1),
				mmm:  dF.i18n.monthNames[m],
				mmmm: dF.i18n.monthNames[m + 12],
				yy:   String(y).slice(2),
				yyyy: y,
				h:    H % 12 || 12,
				hh:   pad(H % 12 || 12),
				H:    H,
				HH:   pad(H),
				M:    M,
				MM:   pad(M),
				s:    s,
				ss:   pad(s),
				l:    pad(L, 3),
				L:    pad(L > 99 ? Math.round(L / 10) : L),
				t:    H < 12 ? "a"  : "p",
				tt:   H < 12 ? "am" : "pm",
				T:    H < 12 ? "A"  : "P",
				TT:   H < 12 ? "AM" : "PM",
				Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
			};

		return mask.replace(token, function ($0) {
			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
		});
	};
}();

// Some common format strings
dateFormat.masks = {
	"default":      "ddd mmm dd yyyy HH:MM:ss",
	shortDate:      "m/d/yy",
	mediumDate:     "mmm d, yyyy",
	longDate:       "mmmm d, yyyy",
	fullDate:       "dddd, mmmm d, yyyy",
	shortTime:      "h:MM TT",
	mediumTime:     "h:MM:ss TT",
	longTime:       "h:MM:ss TT Z",
	isoDate:        "yyyy-mm-dd",
	isoTime:        "HH:MM:ss",
	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
	dayNames: [
		"Dom", "Lun", "Mar", "Mie", "Jue", "Vie", "Sab",
		"Domingo", "Lunes", "Martes", "Miercoles", "Jueves", "Viernes", "Sábado"
	],
	monthNames: [
		"Ene", "Feb", "Mar", "Abr", "May", "Jun", "Jul", "Ago", "Sep", "Oct", "Nov", "Dic",
		"Enero", "Febrero", "Marzo", "Abril", "Mayo", "Junio", "Julio", "Agosto", "Septiembre", "Octubre", "Noviembre", "Deciembre"
	]
};

// For convenience...
Date.prototype.format = function (mask, utc) {
	return dateFormat(this, mask, utc);
};