a.edit
{
    background-image: url("../Images/Buttons/edit.png");
    background-position: top left;
    background-repeat: no-repeat;
    width:49px;
    height:22px;
    display: inline-table;
    text-decoration:none;
    clear:none;
}

a:hover.edit
{
    background-image: url("../Images/Buttons/editOn.png");
    background-position: top left;
    background-repeat: no-repeat;
}

<%= Ajax.ActionLink(" ", "EditClaim", "Driver", new { claimId = item.Id }, new AjaxOptions { HttpMethod = "GET", UpdateTargetId = "claim", OnSuccess="showAddClaim", OnComplete = "updateClaim"}, new { @class = "edit" })%>