<select onchange="change(this, 'checkboxes');">
<option value="zero">- выберите -</option>
<option value="aaa" id="aaa">aaa</option>
<option value="bbb" id="bbb">bbb</option>
<option value="ccc" id="ccc">ccc</option>
<option value="ddd" id="ddd">ddd</option>
</select>
<div id="checkboxes">
<label id="111"><input type="checkbox" name="f">111</label>
<label id="222"><input type="checkbox" name="f">222</label>
<label id="333"><input type="checkbox" name="f">333</label>
<label id="444"><input type="checkbox" name="f">444</label>
<label id="555"><input type="checkbox" name="f">555</label>
</div>
<script>
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return p}('e f(6,5){7 1=6.g;7 3=8.b(5).c(\'a\');4(i=0;i<3.9;i++)3[i].2=h;4(i=0;i<d[1].9;i++){8.b(d[1][i]).c(\'a\')[0].2=\'2\'}}',19,19
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</script>