Some jQuery Validation rules for Money

jquery_validation_rules.js

$.validator.addMethod("lessOrEqualsThan", function(value, element, param) {
	var parsedValue = value.replace(/\./g, "").replace(",", ".");
	return this.optional(element) || (parseFloat(parsedValue) <= param);
}, "Valor deve ser menor ou igual a {0}.");

$.validator.addMethod("inRange", function(value, element, param) {
	var parsedValue = value.replace(/\./g, "").replace(",", ".");
	var amount = parseFloat(parsedValue);
	return this.optional(element) || (amount >= param[0] && amount <= param[1]);
}, "Valor deve estar entre {0} e {1}.");

// or you can do
$.extend($.validator.methods, {
    date: function(value, element) {
        return this.optional(element) || /^\d\d?\/\d\d?\/\d\d\d?\d?$/.test(value);
    },
    number: function(value, element) {
        return this.optional(element) || /^-?(?:\d+|\d{1,3}(?:\.\d{3})+)(?:,\d+)?$/.test(value);
    },
    range: function(value, element, param) {
	var parsedValue = value.replace(/\./g, "").replace(",", ".");
	var amount = parseFloat(parsedValue);
	return this.optional(element) || (amount >= param[0] && amount <= param[1]);
    }
});

More informations,
http://levidad.wordpress.com/2011/07/11/mvc-3-validacao-para-culturas-como-pt-br/