<html>
<title>Titel</title>
<head>
<script type="text/javascript">
<!--
function blaettern(d)
{
e=document.forms[0].elements[0];
s=e.selectedIndex;
if(s+d>-1&&s+d<e.options.length){e.options[s+d].selected=true;}
}
//-->
</script>
</head>
<body>
<form>
<select>
<option>bla1</option>
<option>bla2</option>
<option>bla3</option>
</select>
<input type="button"value="<"onmouseup="blaettern(-1);">
<input type="button"value=">"onmouseup="blaettern(1);">
</form>
</body>
</html>