div#submitForm input {
background: url("../images/buttonbg.png") no-repeat scroll 0 0 transparent;
color: #000000;
cursor: pointer;
font-weight: bold;
height: 20px;
padding-bottom: 2px;
width: 75px;
}
<button type=submit style="background: #ccc url(test.jpg); padding: 0.5em 1em">Go!</button>