.bordure_photo_L {
    float: left;
    padding: 3px;
    border: 1px solid #dddddd;
    margin-right: 8px;
}

.bordure_photo_R {
    float: right;
    padding: 3px;
    border: 1px solid #dddddd;
    margin-left: 8px;
}

.clear
{
 width:100%;
 clear:both;
}