Hallo Ingo,
Lösung gefunden ...
.button_submit {
   width:60%;
   margin:0 auto; padding:0;
   width:104px; height:20px;
}
.button_submit a {
   width:100%; height:100%;
   display:block;
   background:url(/img/button_submit.gif);
}
.button_submit a:hover {
   background:url(/img/button_submit_hover.gif);
}
<div class="button_submit"><a href="#"></a></div>
klappt. Danke :)
Greez,
opi
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