.jshadow {
    position: absolute;
}
.jshadow.top_left {
    width: 20px;
    background: url(img/top-lft.png);
}
.jshadow.top_right {
    width: 20px;
    background: url(img/top-rgt.png);    
}
.jshadow.bot_left,
.jshadow.bot_right {
    width: 20px;
    height: 30px;
}
.jshadow.bot_left {
    background: url(img/bot-lft.png);
}
.jshadow.bot_right {
    background: url(img/bot-rgt.png);
}
.jshadow.bot_mid {
    height: 30px;
    background: url(img/bot-mid.png);
}