function checkAll()
{
	var myBoxes = document.getElementsByName("model[]");
	for (x = 0; x < myBoxes.length; x++) {
		myBoxes[x].checked = true;
	}
}

function clearAll()
{
	var myBoxes = document.getElementsByName("model[]");
	for (x = 0; x < myBoxes.length; x++) {
		myBoxes[x].checked = false;
	}
}