table.tablesorter thead tr .header {
/* 	background-image: url(bg.gif); */
	background-repeat: no-repeat;
	background-position: center right;
	cursor: pointer;
}

table.tablesorter thead tr .headerSortUp {
/* 	background-image: url(asc.gif); */
}
table.tablesorter thead tr .headerSortDown {
/* 	background-image: url(desc.gif); */
}