//function to display or hide a given element
function expand(myItem)
{
	//this is the ID of the hidden item
	var myItem = document.getElementById(myItem);

	if (myItem.style.display == "block") {
		//items are currently displayed, so hide them
		myItem.style.display = "none";
	} else {
		//items are currently hidden, so display them
		myItem.style.display = "block";
	}
}