.gallerycontainer{
position: relative;
/*Add a height attribute and set to largest image's height to prevent overlaying*/
}

.thumbnail img{
margin: 0 5px 5px 0;
}

.thumbnail:hover{
background-color: transparent;
}

.thumbnail:hover img{
border: 1px solid blue;
}

.thumbnail span{ /*CSS for enlarged image*/
	position: absolute;
	background-color: lightyellow;
	left: -1000px;
	border: 1px dashed gray;
	visibility: hidden;
	color: #000099;
	text-decoration: none;
	padding-top: 4px;
	padding-right: 0px;
	padding-bottom: 4px;
	padding-left: 4px;
}

.thumbnail span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 2px;
}

.thumbnail:hover span{ /*CSS for enlarged image*/
visibility: visible;
top: 0;
left: 7%; /*position where enlarged image should offset horizontally */
z-index: 50;
}