.balloonstyle{
position:absolute;
top: -500px;
left: 0;
padding: 5px;
visibility: hidden;
border:1px solid black;
font:normal 12px Verdana;
line-height: 18px;
z-index: 100;
background-color: white;
width: 200px;
/*Remove below line to remove shadow. Below line should always appear last within this CSS*/
filter: progid:DXImageTransform.Microsoft.Shadow(color=gray,direction=135,Strength=5);
}

#arrowhead{
z-index: 99;
position:absolute;
top: -500px;
left: 0;
visibility: hidden;
}

.thumbnail{
position: relative;
z-index: 0;
}

.thumbnail:hover{
background-color: transparent;
z-index: 50;
}

.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
background-color: lightyellow;
padding: 5px;
left: -1000px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;
}

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

.thumbnail:hover span{ /*CSS for enlarged image on hover*/
visibility: visible;
top: -100;
left: 170px; /*position where enlarged image should offset horizontally */

}