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, . on keypad
            key == 190 || key == 188 || key == 109 || key == 110 ||
            // 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;
        });
    });
}