<SCRIPT type=text/javascript>
var c=0
var t
function qq()
{
document.getElementById('txt').options.add(new Option(c, c));
c=c+1;
t=setTimeout("qq()",1000);
}
function tt()
{
clearTimeout(t)
}
</SCRIPT>
<FORM>
<SELECT name=txt></SELECT>
<INPUT onclick=qq() type=button value=Start>
<INPUT onclick=tt() type=button value=Stop!>
</FORM>
var c=0
var t
function qq()
{
document.getElementById('txt').options.add(new Option(c, c));
c=c+1;
t=setTimeout("qq()",1000);
}
function tt()
{
clearTimeout(t)
}
</SCRIPT>
<FORM>
<SELECT name=txt></SELECT>
<INPUT onclick=qq() type=button value=Start>
<INPUT onclick=tt() type=button value=Stop!>
</FORM>