<form name=temp>
<select name=select1 onchange=javascript:select2.selectedIndex=this.selectedIndex>
<option value=A>A</option>
<option value=B>B</option>
<option value=C>C</option>
</select>
<select name=select2>
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
</form>
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