#nav li:hover li:hover li:hover li:hover li a.fly
{background:white url(arrow.gif) 160px 6px no-repeat; color:#000; border-color:#0099ff;} 

#nav li:hover ul.sub
{left:1px; top:38px; background: white; padding:3px; border:1px solid #000099; white-space:nowrap; width:170px; height:auto; z-index:300;}