<input type="button" name="Submit" value=" >> " onclick=doNext()>
<script>
function doNext(){
n=document.all.select.options.length;
i=document.all.select.selectedIndex;
i++;
if (i<n) document.all.select.selectedIndex=i;
}
</script>
<script>
function doNext(){
n=document.all.select.options.length;
i=document.all.select.selectedIndex;
i++;
if (i<n) document.all.select.selectedIndex=i;
}
</script>
<option>1</option>
<option>2</option>
<option>3</option>
</select>
<input type="button" name="Submit" value=" >> " onclick="if(select1.selectedIndex+1< select1.options.length) select1.options[select1.selectedIndex+1].selected=true;else{select1.options[0].selected=true;}">