codice:
<script type="text/javascript">
var passo=10
var timer=false
function scrolla(){
  parent.nomeFrame.scrollBy(passo,0);
  timer=setTimeout('scrolla()',50);
}
function ferma(){
  if(timer) clearTimeout(timer);
}
</script>
<form>
<input type="button" value="scrolla()" onmouseover="scrolla()" onmouseout="ferma()" />
</form>
ciao