div.tab_container {
    border: 1px solid red;
    height: 100px;
/*    display: none;*/
}

div.tab_on {
    width: 145px;
    height: 29px;
    line-height: 26px;;
    float:left;
    padding-left: 4px;
    font-family: Verdana,Arial,Helvetica,sans-serif;
    font-size: 10px;
    color: #313131;
    text-align : center;
    text-transform: uppercase;
    background-image: url(/images/tabs_button_lft_on_152x29.gif);
    margin-right: 2px;
}
div.tab_off {
    width: 145px;
    height: 27px;
    line-height: 26px;;
    float:left;
    padding-left: 4px;
    font-family: Verdana,Arial,Helvetica,sans-serif;
    font-size: 10px;
    color: #313131;
    text-align : center;
    text-transform: uppercase;
    background-image: url(/images/tabs_button_off_154x29.gif);
    margin-right: 2px;
    cursor: pointer;
}