function createNumberInput(inputClassName, opts) {
    var wrapper = createElement("div", "numInputWrapper"), numInput = createElement("input", "numInput " + inputClassName), arrowUp = createElement("span", "arrowUp"), arrowDown = createElement("span", "arrowDown");
    if (navigator.userAgent.indexOf("MSIE 9.0") === -1) {
        numInput.type = "number";
    }