function number_format(num, decimal, decimalSep, milharSep) {
    /*
     @author: Rafael Alves - contato@rafaelsouza.net
     @date: 2014-13-03
     @description: funcao similar a number_format do php. Retorna um numero formatado de acordo com os parametros informados
     @params: num: o numero a ser formatado,
     decimal: quantidade de casas apos a virgula,
     decimalSep: separador da casa decimal - default: ".",
     milharSep: separador da casa de milhar - default: ","
     */
    decimalSep = decimalSep ? decimalSep : '.';
    milharSep = milharSep ? milharSep : ' ';

    var intval = parseInt(num);
    if (String(num).indexOf('.') !== -1) {
	var decval = String(num).split('.');
	decval = decval[1];
    }

    intval = String(intval).split('');
    intval = intval.reverse();
    var c = 1;
    var aux = '';
    for (var i = 0; i < intval.length; i++) {
	aux += intval[i];
	if (c == 3 && i != intval.length - 1) {
	    aux += milharSep;
	    c = 1;
	} else
	    c++;
    }
    aux = aux.split("").reverse().join("");
    intval = aux;
    if (decval) {
	decval = String(decval).substring(0, decimal);
    } else
	decval = '';
    while (decval.length < decimal) {
	decval += '0';
    }
    num = String(intval) + (decval ? decimalSep + decval : "");
    return num;
}

function empty(mixed_var) {	// Determine whether a variable is empty
    // 
    // +   original by: Philippe Baumann

    return (mixed_var === "" || mixed_var === 0 || mixed_var === "0" || mixed_var === null || mixed_var === false || (is_array(mixed_var) && mixed_var.length === 0) || mixed_var == "NaN");
}

function is_array(mixed_var) {	// Finds whether a variable is an array
    // 
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Legaev Andrey
    // +   bugfixed by: Cord

    return (mixed_var instanceof Array);
}


function explode(delimiter, string) {	// Split a string by string
    // 
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: kenneth
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

    var emptyArray = {0: ''};

    if (arguments.length != 2
	    || typeof arguments[0] == 'undefined'
	    || typeof arguments[1] == 'undefined')
    {
	return null;
    }

    if (delimiter === ''
	    || delimiter === false
	    || delimiter === null)
    {
	return false;
    }

    if (typeof delimiter == 'function'
	    || typeof delimiter == 'object'
	    || typeof string == 'function'
	    || typeof string == 'object')
    {
	return emptyArray;
    }

    if (delimiter === true) {
	delimiter = '1';
    }

    return string.toString().split(delimiter.toString());
}

function in_array(needle, haystack, strict) {	// Checks if a value exists in an array
    // 
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

    var found = false, key, strict = !!strict;

    for (key in haystack) {
	if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
	    found = true;
	    break;
	}
    }

    return found;
}