css navigation menu

this is just a bit example for making menu navigation with ccs:

css:

a.menu_nav{
width: 106px; /*this is important */
height: 40px; /*this is important */
background-image:url(images/nav_bg.jpg); /*this is important */
float:left;
border: 0px;
display: block;
text-decoration: none;
text-align:center;
}
a.menu_nav:link {font-size:13px; line-height:35px; color:#656565}
a.menu_nav:visited {font-size:13px; line-height:35px; color:#656565}
a.menu_nav:hover {background-position: 0-40px;}

a.menu:hover {
background-position: 0-40px; /*this is important */
}

html:

<div>
  <a href="#" class="menu_nav">Home</a>
  <a href="#" class="menu_nav">About US</a>
  <a href="#" class="menu_nav">Product</a>
  <a href="#" class="menu_nav">News Update</a>
  <a href="#" class="menu_nav">Contact Us</a>
</div>