function toggle_box(caller, targetid)
{
	if(document.getElementById(targetid).style.display == 'block')
	{
		document.getElementById(targetid).style.display = 'none';
		caller.className = 'r2title_closed';
	}
	else
	{
		document.getElementById(targetid).style.display = 'block';
		caller.className = 'r2title_opened';
	}
}