function hasClass(el, cls) {
  return el.className && new RegExp("(\\s|^)" + cls + "(\\s|$)").test(el.className);
}
function removeClass(ele,cls) {
    if (hasClass(ele,cls)) {
        var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
        ele.className=ele.className.replace(reg,' ');
    }
}
function removeId(id) {
    return (elem=document.getElementById(id)).parentNode.removeChild(elem);
}