function openModalCalculator() {
    MOOdalBox.open(
    "CalculadoraCuota.html",
    "Cotizador de Viviendas Universales",
    "540 500");
}

function Querystring() {

    // get the query string, ignore the ? at the front.

    var querystring = location.search.substring(1, location.search.length);



    // parse out name/value pairs separated via &

    var args = querystring.split('&');



    // split out each name = value pair

    for (var i = 0; i < args.length; i++) {

        var pair = args[i].split('=');



        // Fix broken unescaping

        temp = unescape(pair[0]).split('+');

        name = temp.join(' ');



        temp = unescape(pair[1]).split('+');

        value = temp.join(' ');



        this[name] = value;

    }



    this.get = Querystring_get;

}





function Querystring_get(strKey, strDefault) {

    var value = this[strKey];

    if (value == null) {

        value = strDefault;

    }



    return value;

}