jQuery.fn.onlyNumber = function (settings) {
    var defaults = {
        except: "-.A"
    },
		    settings = jQuery.extend({}, defaults, settings || {}),
		    except = [];

    for (var i = 0; i < settings.except.length; i++) {
        except.push(settings.except.charCodeAt(i));
    }

    return this.each(function () {
        jQuery(this).keypress(function (e) {
            if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57) && $.inArray(e.which, except) == -1)
                return false;
        });
    });
}