input[type=submit] {
font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
font-size: 13px;
line-height:20px;
font-weight: bold;
background: transparent url("../media/images/commun/bt-newsletter.png") no-repeat;
border:none;
margin:0;
color: #fff;
height:27px;
cursor:pointer;
}

input[type=submit]:hover {
background: transparent url("../media/images/commun/bt-newsletter-over.png") no-repeat;
}