<input type="text" name="v" id="v" />
<input type="button" value="select" onclick="window.open('select.htm')" />-----------------------------
select.htm
-----------------------------
<select name="s" id="s">
<option value="a">a</option>
<option value="b">b</option>
<option value="c">c</option>
<option value="d">d</option>
</select>
<input type="button" value="ok" onclick="opener.document.getElementById('v').value=s.value" />
<input type="button" value="select" onclick="window.open('select.htm')" />-----------------------------
select.htm
-----------------------------
<select name="s" id="s">
<option value="a">a</option>
<option value="b">b</option>
<option value="c">c</option>
<option value="d">d</option>
</select>
<input type="button" value="ok" onclick="opener.document.getElementById('v').value=s.value" />
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