oder mit javascript:
<html>
<head>
<script type="text/javascript" language="JavaScript">
<!--
function submitIt(){
abb.submit();
}
-->
</script>
</head>
<body>
<form name="abb" method="POST" action=".">
(...)
<img src="muhNormal.gif" onclick="JavaScript:submitIt()">
</form>
</body>
</html>