#container{
	position:relative;
	margin:0 auto;
	width:800px;
	height:700px;
	border-style:solid;
	border-width:3px;
	border-color:#333333;
}
canvas#center_circle{
	position:relative;
	z-index:0;
}
canvas#small_circle{
	position:relative;
	opacity:0.4;
	margin-left:40px;
	cursor:pointer;
	z-index:1;
}
canvas#small_circle:hover{
	opacity:1.0;
}
canvas#medium_circle{
	position:relative;
	opacity:0.4;
	z-index:2;
}
canvas#medium_circle:hover{
	opacity:1.0;
}