th.headerSort
{
   /* background-image: url(images/updown_arrow.jpg);*/
   /* background-repeat: no-repeat;*/
   /* background-position: center right;*/
}
th.headerSortUp
{
    /*background-image: url(images/up_arrow.jpg);*/
}
th.headerSortDown
{
    /*background-image: url(images/down_arrow.jpg);*/
}