/**
* Change element css class
*/
function changeClass(id, className)
{
	var elem = document.getElementById(id);
	if (elem)
	{
		elem.className = className;
	}
}

/**
* Change button style
*/
function buttonHover(id, active)
{
	if (active)
	{
		changeClass('start' + id, 'startActive');
		changeClass('label' + id, 'labelActive');
		changeClass('end' + id, 'endActive');
	}
	else
	{
		changeClass('start' + id, 'start');
		changeClass('label' + id, 'label');
		changeClass('end' + id, 'end');
	}
}