/* show / hide function by Mihaly Zagon*/
visible = new Array();
function show(id, vid) {
	if (visible[vid]) {
		hide(visible[vid],vid);
	}
	document.getElementById(id).style.display = '';
	visible[vid] = id;
}

function hide(id, vid) {
	prev = visible[vid];
	document.getElementById(prev).style.display = 'none';
	visible[vid] = false;
}

function change_display(id,vid) {
	if (visible[vid]==id) {
		hide(id,vid);
	} else show(id,vid);
}