.container {
			position: relative;
			float: left;
		}
		.container img { display: block; border: none; vertical-align: top; }
		.container span {
			position: absolute;
			display: block;
			height: 16px; width: 16px;
			background: transparent no-repeat top left;
		}
		.container span.top-left{
			background-image: url(http://phrogz.net/tmp/corners/c1.gif);
			top: 0; left: 0;
		}
		.container span.top-right{
			background-image: url(http://phrogz.net/tmp/corners/c2.gif);
			top: 0; right: 0;
		}
		.container span.bottom-left{
			background-image: url(http://phrogz.net/tmp/corners/c4.gif);
			bottom: 0; left: 0;
		}
		.container span.bottom-right{
			background-image: url(http://phrogz.net/tmp/corners/c3.gif);
			bottom: 0; right: 0;
		}