어느분 질문을 보고 초보가 무식한 것 하나 적습니다.
 옵션 필드를 적절히 수정해서 사용하시면 됩니다.
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function formHandler(form){
var URL = document.form.site.options[document.form.site.selectedIndex].value;
window.location.href = URL;
}

function formHandler2(form2){
var URL = document.form2.site2.options[document.form2.site2.selectedIndex].value;
window.location.href = URL;
}

function formHandler3(form3){
var URL = document.form3.site3.options[document.form3.site3.selectedIndex].value;
window.location.href = URL;
}
// End -->
</SCRIPT>
<table align=center>
<tr>
<td>
<center>
<form name="form">
<select name="site" size=1 onChange="javascript:formHandler()">
<option value="">갈곳을 정하세요
<option value="http://kr.yahoo.com">Yahoo! Korea
<option value="http://www.metacrawler.com">Metacrawler
<option value="http://www.altavista.digital.com">Altavista
<option value="http://www.webcrawler.com">Webcrawler
<option value="http://www.lycos.com">Lycos
<option value="http://www.jasko.co.kr">자스코
</select>
</form>
</center>
</td>
<td>
<center>
<form name="form2">
<select name="site2" size=1 onChange="javascript:formHandler2()">
<option value="">갈곳을 정하세요
<option value="http://kr.yahoo.com">Yahoo! Korea
<option value="http://www.metacrawler.com">Metacrawler
<option value="http://www.altavista.digital.com">Altavista
<option value="http://www.webcrawler.com">Webcrawler
<option value="http://www.lycos.com">Lycos
<option value="http://www.hanmir.com">Hanmir
</select>
</form>
</center>
</td>
<td>
<center>
<form name="form3">
<select name="site3" size=1 onChange="javascript:formHandler3()">
<option value="">갈곳을 정하세요
<option value="http://kr.yahoo.com">Yahoo! Korea
<option value="http://www.metacrawler.com">Metacrawler
<option value="http://www.altavista.digital.com">Altavista
<option value="http://www.slgi.co.kr/gnu3/?doc=bbs/gnuboard.php&bo_table=qa&sselect=ca_id&stext=3">알림
<option value="http://www.slgi.co.kr/gnu3/?doc=bbs/gnuboard.php&bo_table=qa&sselect=ca_id&stext=2">기타
<option value="http://www.slgi.co.kr/gnu3/?doc=bbs/gnuboard.php&bo_table=qa&sselect=ca_id&stext=1">그누보드
</select>
</form>
</center>
</td>
</tr>
</table>