function hasClass(ele, cls) {
	return ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
}
 
function addClass(ele, cls) {
	if (!this.hasClass(ele, cls)) ele.className += " " + cls;
}
 
function removeClass(ele, cls) {
	if (hasClass(ele, cls)) {
    	var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
		ele.className = ele.className.replace(reg, ' ');
	}
}