function validateElement($obj) {
        var email = null;
        var isEmpty = false;
        var isInvalid = false;
        
        $obj.removeClass('valid');
        $obj.removeClass('error');
        $obj.removeClass('invalid');

        if ($obj.hasClass('required')==true) {
            if ($obj.is('input[type=text]') || $obj.is('input[type=password]') || $obj.is('textarea') || $obj.is('select')) {
                if (jQuery.trim($obj.val()) == ''){
                    isEmpty = true;
                }
            } else if ($obj.is('input[type=checkbox]')) {
                var rel = $obj.attr('rel');
                if (rel==undefined) {
                    if (!$obj.is(':checked')){
                        isEmpty = true;
                    }
                } else {
                    length = $(document).find('input:checked[rel="'+rel+'"]').length;
                    if (length==0) isEmpty = true;
                }
            } else if ($obj.is('input[type=radio]')) {
                var name = $obj.attr('name');
                var length = $(document).find('input:radio[name="' + name + '"]:checked').length;
                if (length==0) isEmpty = true;
            }
        }


        if ($obj.hasClass('confirm')==true) {
            var rel = $obj.attr('rel');
            var $compare = $(document).find('[rel$="'+rel+'"]');
            if ($compare.length) {
                if ($obj.val() != $compare.val()) isInvalid = true;
            }
        }

        if ($obj.hasClass('email')==true) {
            if(!/^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i.test($obj.val()))
                isInvalid=true;

        } else if ($obj.hasClass('number')==true) {
            if(!/^-?(?:\d+|\d{1,3}(?:,\d{3})+)(?:\.\d+)?$/.test($obj.val()))
                isInvalid=true;

        } else if ($obj.hasClass('digits')==true) {
            if(!/^\d+$/.test($obj.val()))
                isInvalid = true;
        }

        if ($obj.hasClass('nozero') && $obj.val()==0) {
            isInvalid = true;
        }

        if (isInvalid==true || isEmpty==true) {
            if (isInvalid==true) $obj.addClass('invalid');
            if (isEmpty==true) $obj.addClass('error');
        } else {
            $obj.addClass('valid');
        }

        return (isInvalid==false && isEmpty==false);
    }