.thumb {
 margin-left:auto;
 margin-right:auto;
 width:auto;
 border:none;
 padding:8px;
 vertical-align: middle; 
}

.tablediv {
 display:  table;
 width:100%;
 border-spacing:5px;/*cellspacing:poor IE support for  this*/
 border-collapse:separate;
}
.rowdiv  {
 display:  table-row;
 width:100%;
}
.celldiv {
 text-align: center;
 display:  table-cell;
 width:100%;
}