(function ($) {

    // forceNumeric() plug-in implementation
    jQuery.fn.forceNumeric = function () {

        return this.each(function () {
            $(this).keydown(function (e) {
                var key = e.which || e.keyCode;

                if 
                (
                    !e.shiftKey
                    && !e.altKey
                    && !e.ctrlKey
                    &&
                    (
                        // numbers   
                        (key >= 48 && key <= 57)
                        // Numeric keypad
                        || (key >= 96 && key <= 105)
                        // comma, period and minus
                        || key == 190 || key == 188 || key == 109
                        // Backspace and Tab and Enter
                        || key == 8 || key == 9 || key == 13
                        // Home and End
                        || key == 35 || key == 36
                        // left and right arrows
                        || key == 37 || key == 39
                        // Del and Ins
                        || key == 46 || key == 45
                    )
                )
                    return true;

                return false;
            });
        });
    }

})(jQuery);