function clickedon(chooser){
	clearall();
	var option = document.getElementById(chooser);
	option.style.backgroundPosition="top";
	switch (chooser){
		case 'a1': document.getElementById('a1a').style.display="block"; break;
		case 'a2': document.getElementById('a2a').style.display="block"; break;		
		case 'a3': document.getElementById('a3a').style.display="block"; break;		
		case 'a4': document.getElementById('a4a').style.display="block"; break;		
		case 'a5': document.getElementById('a5a').style.display="block"; break;		
		case 'a6': document.getElementById('a6a').style.display="block"; break;		
		case 'a7': document.getElementById('a7a').style.display="block"; break;		
	}

}

function clearall(){
	document.getElementById('a0a').style.display="none";
	document.getElementById('a1').style.backgroundPosition="bottom";
	document.getElementById('a1a').style.display="";
	document.getElementById('a2').style.backgroundPosition="bottom";	
	document.getElementById('a2a').style.display="";
	document.getElementById('a3').style.backgroundPosition="bottom";	
	document.getElementById('a3a').style.display="";
	document.getElementById('a4').style.backgroundPosition="bottom";	
	document.getElementById('a4a').style.display="";
	document.getElementById('a5').style.backgroundPosition="bottom";	
	document.getElementById('a5a').style.display="";
	document.getElementById('a6').style.backgroundPosition="bottom";	
	document.getElementById('a6a').style.display="";
	document.getElementById('a7').style.backgroundPosition="bottom";	
	document.getElementById('a7a').style.display="";
}