<script>
function select_box(no) {
if(no == 1){
document.Form.List2.disabled = true;
document.Form.List1.disabled = false;
}else if(no == 2){
document.Form.List1.disabled = true;
document.Form.List2.disabled = false;
}
}
</script>
<form name="Form">
<input type="radio" value="1" name="r1" onClick="select_box(1)" />aaaa<br />
<input type="radio" value="2" name="r1" onClick="select_box(2)" />AAAA<br />
<br />
<select name="List1">
<option value="1">aaaa</option>
<option value="2">bbbb</option>
</select>
<select name="List2">
<option value="1">AAAA</option>
<option value="2">BBBB</option>
<option value="3">CCCC</option>
</select>
</form>
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