求救!!!

Question

<select name=sel onchange="thisform.test.value=thsi.value">

Answer 1

<script language=javascript>
function setValue()
{
  document.thisform.test2.value = document.thisform.sel.value;
}
</script>
<form name="thisform" >
<select name=sel onchange="setValue()">
<option value=a>a</option>
<option value=b>b</option>
</select>
<textarea cols=2 row=6 name=test2></textarea>
</form>

Answer 2

sorry, change test2==>test

Answer 3

<script>
function set(){
var index=document.thisform.sel.selectedIndex 
selvalue=document.thisform.sel[index].value
document.thisform.test.value=selvalue
}
</script>