.ktb-shadow {
    display: block;
    position: relative;
    margin: 10px -10px -10px 10px;
    background: url("http://toolbox.keirn.fr/shadow/shadow.png") right bottom no-repeat;
    _behavior: url("iepngfix.htc");
}

.ktb-shadow:before,
.ktb-shadow:after {
    content: " ";
    display: block;
    width: 10px;
    height: 10px;
    background: inherit;
}

.ktb-shadow:before {
    position: absolute;
    top: 0;
    right: 0;
    margin: -10px 0 0 auto;
    background-position: right top;
}

.ktb-shadow:after {
    margin: -10px 0 0 -10px;
    background-position: left bottom;
}

.ktb-shadow .ktb-shadow-inner {
    display: block;
    position: relative;
    overflow: hidden;
    left: -10px;
    top: -10px;
    margin: 0;
    width: 100%;
    background: white;
}