color: transparent;

font-size: 0px;
line-height: 0;
text-indent: -1000em;
display: block;
padding-left: 1000px;

<INPUT TYPE="image" SRC="images/yourButtongif" HEIGHT="30" WIDTH="100" ALT="Text In Case There Is No Image" />

<input type="image" src="/images/some_image.png" />

input[type="image"] {
  border: 1px solid red;
  width: 150px;
  height: 35px;
}

<a href="javascript:return false;" class="button" id="buttonOK"><span
    class="icon">Ok</span></a>

span.icon {
    /*visibility: hidden;*/
    display:block;
    margin-left:-1000;
    width:100px;
}

span.icon {
    visibility: hidden;
}

{ display: block;
text-indent: -9999em;
text-transform: uppercase; }

color: transparent;

padding-left: 3000px;
overflow: hidden;