function change_piece (what) {
	link_id = what.id;
	
	// content areas are named corresponding to their associated link
	hiddenContentID = link_id + "_content";
	
	hiddenContent = document.getElementById(hiddenContentID);
	visibleContent = document.getElementById("container");
	
	// copies the html from the invisible content area to the visible area
	visibleContent.innerHTML = hiddenContent.innerHTML;
	
	/*
	list_handle = what.parentNode;
	// looks for anchors within the parent div and removes the class name
	anchor_list = list_handle.getElementsByTagName("a");
	for (i=0; i < anchor_list.length; i++) {
		anchor_list[i].className = "";
	}
	
	//sets class name for permanant rollover state
	what.className = "currentThumb";*/
}