function elementAddClass(ctrl, className)
{
	var regex = new RegExp("\s?"+className+"\s?");
	
	if(regex.test(ctrl.className))
		return;
	
	ctrl.className += " "+className;
}

function elementRemoveClass(ctrl, className)
{
	var regex = new RegExp("\s?"+className+"\s?");
	ctrl.className = ctrl.className.replace(regex, " ");
}

function elementContainsClass(ctrl, className)
{
	var regex = new RegExp("\s?"+className+"\s?");
	return (ctrl.className.search(regex) != -1)
}

function setElementText(ctrl, text)
{
	if(ctrl.firstChild == null)
		ctrl.appendChild(document.createTextNode(text));
	else
		ctrl.firstChild.nodeValue = text;
}

function elementAddEventListener(element, eventName, callback)
{
	if(element.addEventListener)
		element.addEventListener(eventName, callback, false);
	else if(element.attachEvent)
		element.attachEvent("on"+eventName, callback);
}