#chk{
	width:50px;
	height:50px;
	background-color:red;
}

a.crop{
	display:block;
	width:10px;
	height:10px;
	line-height:10px;
	overflow:hidden;
	position:relative;
	z-index:1;		
}
a.crop img{
	float:left;
	position:absolute;
}
img.gImage{
	float:left;
	visibility:visible;
}