function toggle_panel(id, heading_id){
	if (document.getElementById) {// DOM3 = IE5, NS6
		panel_id = document.getElementById(id);
		header_id = document.getElementById(heading_id);
	}	else {
		if (document.layers){// Netscape 4
			panel_id = document.id;
			header_id = document.heading_id;
		}	else { // IE 4
			panel_id = document.all.id;
			header_id = document.all.heading_id;
		}
	}
	toggle_panel_display(panel_id, header_id);
}
function toggle_panel_display(id, header_id){
	id.style.display == 'none' ? id.style.display='block' : id.style.display='none';
	header_id.className == 'panel-header-on' ? header_id.className = 'panel-header-off' : header_id.className = 'panel-header-on';
}