var OldOpened = 0;
function ToggleDisplay(id) {
	
	var elem = document.getElementById('d' + id);
	var im = document.getElementById('ar' + id);
	var oelem;
	var oim;
	
	if ( OldOpened > 0) {
		oelem = document.getElementById('d' + OldOpened);
		oim = document.getElementById('ar' + OldOpened);
		oelem.style.display = 'none';
		oelem.style.visibility = 'hidden';
		oim.src = "../Media/c2.gif";
	}	
	if ( OldOpened == id) {
		if (elem.style.display != 'block') {
			elem.style.display = 'block';
			elem.style.visibility = 'visible';
			im.src = "../Media/c2.gif";
			OldOpened = 0;
		}
	}	
	if (elem) {
	  	if (elem.style.display != 'block') {
			elem.style.display = 'block';
			elem.style.visibility = 'visible';
			im.src = "../Media/c3.gif";
			OldOpened = id;
	 	 } 
	  	else {
			elem.style.display = 'none';
			elem.style.visibility = 'hidden';
			im.src = "../Media/c2.gif";
	  	}
	}
	
}