thead th {
    background-repeat: no-repeat;
    background-position: left center;
}

thead th.unsort {
    padding-right 15px;
    padding-left: 15px;
    /* Metro-dark */
    background-image: url(data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAQBAMAAADQT4M0AAAAGFBMVEUAAADu7u7u7u7u7u7u7u7u7u7u7u7u7u5jNePWAAAACHRSTlMAMxIHKwEgMWD59H4AAABSSURBVAjXY2BgYFJgAAHzYhDJ6igSAKTYBAUTgJSioKAQAwNzoaCguAFDiCAQuDIkgigxBgiA8cJAVCpQt6AgSL+JoKAzA0gjUBsQqBcBCYhFAAE/CV4zeSzxAAAAAElFTkSuQmCC);
    /* Black Ice : */
    background-image: url(data:image/gif;base64,R0lGODlhFQAJAIAAAP///////yH5BAEAAAEALAAAAAAVAAkAAAIXjI+AywnaYnhUMoqt3gZXPmVg94yJVQAAOw==);
}

thead th.up {
    padding-right: 15px;
    padding-left: 15px;
    /*background-image: url(data:image/gif;base64,R0lGODlhFQAEAIAAACMtMP///yH5BAEAAAEALAAAAAAVAAQAAAINjI8Bya2wnINUMopZAQA7);*/
    /* Metro-dark */
    background-image: url(data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAQBAMAAADQT4M0AAAAIVBMVEUAAADu7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u5meJAOAAAACnRSTlMAMwsqXt+gIBUGxGoDMAAAAFlJREFUCNctzC0SQAAUReEzGNQ3AlHRiSRZFCVZYgeswRL8hLdK7834wj3tAlGP6y7fYHpKS6w6WwbVG0I1NZVnZPG8/DYxOYlnhUYkA06R1s9ESsxR4NIdPhkPFDFYuEnMAAAAAElFTkSuQmCC);
    /* Black Ice : */
    background-image: url(data:image/gif;base64,R0lGODlhFQAEAIAAAP///////yH5BAEAAAEALAAAAAAVAAQAAAINjI8Bya2wnINUMopZAQA7);
}

thead th.down {
    padding-right: 15px;
    padding-left: 15px;
    /*background-image: url(data:image/gif;base64,R0lGODlhFQAEAIAAACMtMP///yH5BAEAAAEALAAAAAAVAAQAAAINjB+gC+jP2ptn0WskLQA7);*/
    /* Metro-dark */
    background-image: url(data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAQBAMAAADQT4M0AAAALVBMVEUAAADu7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7u7i0NViAAAADnRSTlMAMiweCQITTvDctZZqaTlM310AAABcSURBVAjXY2BgYEtgAAFHERDJqigUAKSYBQUNgFSioKAYAwOLIBA4MASBKFUGQxAlzAAF+94BwWuGKBC1lIFl3rt3Lx0YGCzevWsGSjK9e6cAUlT3HKyW9wADAwDRrBiDy6bKzwAAAABJRU5ErkJggg==);
    /* Black Ice : */
    background-image: url(data:image/gif;base64,R0lGODlhFQAEAIAAAP///////yH5BAEAAAEALAAAAAAVAAQAAAINjB+gC+jP2ptn0WskLQA7);
}

thead th.sorter-false {
    background-image: none;
}