You can use some thing like this:
HTML Code:
<div id="menu"><a href="index.php"> HOME</a>
<a href="item1.php"> ITEM1</a>
<a href="item2.php"> ITEM2</a>
<a href="item3.php"> ITEM3</a>
<a href="item4.php"> ITEM4</a></div>
CSS:
Code:
#menu a {color: #ff0;
border: 1px solid;
background : url(buttons.jpg) no-repeat;
width : xxxpx;
height : xxpx;
border-color: #00ff00;
display: block;
margin: 0px;
text-align: left;}
#menu a:hover {border: 1px solid;
background : url(buttons2.jpg) no-repeat;
color: #0000ff;
text-decoration: none;}
Use buttons.jpg as a background for your nav items and buttons2.jpg as the rollover image for instance!
of course you can tweak the CSS to fit what you need 
Edit:
....beaten by all4nerds!!
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