li:hover  .l_ar {
background:url('../images/l_ar.gif') left top no-repeat;
width:14px;
height:13px;
display:block;
position:absolute;
left:0px;
top:0px;
}

* html a:hover  .r_ar {
background:url('../images/r_ar.gif') left top no-repeat;
width:17px;
height:29px;
display:block;
position:absolute;
right:0px;
top:0px;
}

li:hover  .r_ar {
background:url('../images/r_ar.gif') left top no-repeat;
width:17px;
height:29px;
display:block;
position:absolute;
right:0px;
top:0px;
}