#back148h
{display: block; width: 148px;height: 15px;background: url("images/menu_button_back148.gif") no-repeat 0 0;}
#back148h
{background-position: 0 -15px;}
#back148h span
{display: none;}
#back148h:hover
{background-position: 0 -15px;}
#back148h span
{display: none;}