#nav, #nav ul{
margin:0;
padding:0;
list-style-type:none;
list-style-position:outside;
position:relative;
line-height:1.7em; 
}

#nav a{
display:block;
padding:0px 5px;
border:1px solid #333;
color:#333;
text-decoration:none;
background-color:#ddd;
}

#nav a:hover{
color:#333;
}

#nav li{
float:left;
position:relative;
width:10em;
}

#nav li a{
border:#ccc outset 1px; /*this is the key of having buttons like menu with only CSS*/
text-align:center;
}

#nav ul {
position:absolute;
display:none;
width:12em;
top:1.8em;
}

#nav li ul a{
width:20em;
height:auto;
float:left;
text-align:left;
border-bottom:1px #333 solid;
}

#nav ul ul{
top:auto;
}	

#nav li ul ul {
left:20em;
margin:0px 0 0 10px;
} 

#nav li:hover ul ul, #nav li:hover ul ul ul, #nav li:hover ul ul ul ul{
display:none;
}
#nav li:hover ul, #nav li li:hover ul, #nav li li li:hover ul, #nav li li li li:hover ul{
display:block;
}