.clear {
    clear: both;
}

.clearfix:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0;
}

* html .clearfix { zoom: 1; } /* IE6 */
*+html .clearfix { zoom: 1; } /* IE7 */

.hidden {
    display: none;
}

.left {
    float: left;
}

.right {
    float: right;
}

strong {
    font-weight: bold;
}