Instead of messing around with the left and right padding or margin. I've added text-align:center.
ul#cssmw > li > a {
background-image: none;
color: #FFF;
display: block;
font-family: "Trebuchet MS", Helvetica, sans-serif;
font-size: 10px;
font-style: normal;
font-weight: bold;
height: 16px;
margin: 0 auto;
text-decoration: none;
text-transform: uppercase;
width: 65px;
background-color: #333;
padding: 22px 5px;
text-align: center;
Again thanks for your help