#frame {
    width:340px;
    height:150px;
    border:solid black 1px;
    margin:auto;
    overflow-y:auto;
    }

.item {
    border:solid red 1px;
    width:100px;
    height:100px;
    float:left;
    overflow:hidden;
    }

.item:hover {
    overflow:visible
}
    

.item IMG {
    width:100%;
}