.div_pr_thumb{
float:left;
margin-bottom:5px;
margin-right: 5px;
padding: 3px;
background-repeat:no-repeat;
background-position:center;
text-align:center;
border: 2px solid #666;
}
.div_pr_photo{
background-repeat:no-repeat;
background-position:center;
text-align:center;
}

.thumb_con
{
	float: left;
	padding: 1px; 
	margin: 1px;
	cursor: pointer;
}
img:hover { border: 1px solid Blue; }

.con1 {
border: 1px solid blue;
}
.con2 {
border: 1px solid white;
}