codice:
<script type="text/javascript">
function conf(){
  var conferma = confirm('Procedere?');
  if (conferma){
    document.myForm.submit();
  }
}
</script>
<form name="myForm" id="myForm" action="dovetepare.asp">
<input type="button" value="esegui" onclick="return conf();" />
</form>