<form>
<input type=radio name="aa">radio1<br>
<input type=radio name="aa">radio2<br>
<input type=radio name="aa">radio3<br>
<input type=radio name="aa">radio4<br>
<select name="bb">
<option>select1
<option>select2
<option>select3
<option>select4
<option>select5
</select>
</form>
<script language="JavaScript"><!--
r=document.forms[0].aa.length;
rand=Math.floor(Math.random() * r);
document.forms[0].aa[rand].checked=true;
s=document.forms[0].bb.length;
rand=Math.floor(Math.random() * s);
document.forms[0].bb.options[rand].selected=true;
// --></script>