简单问题

Question

<script language=javascript>
function re(){
var dd=myform.select.value;
document.all.aa.value=dd;
}
</script>
<form name="myform" >
<table>
<tr><td>
<select name="select" size="1" onchange="re()">
<option value="1111">1111
<option value="2222">2222
</select>
</td></tr>
</table>
<table>
<tr>
<td><input value="" id="aa" style="border:0"></td>
</tr>
</table>
</form>

Answer 1

<script language=javascript>
function re(){
var dd=myform.select.value;
main.innerHTML="you want to show";
}
</script>
<form name="myform" >
<table>
<tr><td>
<select name="select" size="1" onchange="re()">
<option value="1111">1111
<option value="2222">2222
</select>
</td></tr>
</table>
<table>
<tr>
<td id=main> </td>
</tr>
</table>
</form>