// Use the state of the element 'control' to hide or show list items matching class
function setDisplay(control, class)
{
	var items = document.getElementsByTagName('li');
	var setvalue;
	if(control.checked)
	{
		setvalue = 'none';
	}
	else
	{
		setvalue = 'list-item';
	}
	for(var i = 0; i < items.length; i++)
	{
		if(items[i].className == class)
		{
			items[i].style.display = setvalue;
		}
	}
}