function on(cur,id,box) { 
	cur.bgColor='#FFEB63';
	cur.style.cursor='default';
	var shift = '-'+id+'px';
	document.getElementById(box).style.backgroundPosition = shift;
	document.getElementById(box).style.border="solid black 2px";
}
function off(cur,box) { 
	cur.bgColor='';
	document.getElementById(box).style.backgroundPosition = '200px';
	document.getElementById(box).style.border="none";
}