<form name="jksearch" action="http://www.google.com/search" method="get" onSubmit="jksitesearch(this)">
<table cellpadding=1>
<tr>
    <td></td>
    <td>Google:<input name="se" type="radio" checked>  Yahoo:<input name="se" type="radio">  MSN:<input name="se" type="radio"></td>
</tr>
<tr>
    <td><B>검색어 : </B></td>
    <td><input id="hiddenquery" type="hidden" name="q"><input name="qfront" type="text" style="width: 200px" value=""> <input type="submit" value="Search"></td>
</tr>
</table>
</form>

<script type="text/javascript">

var domainroot="www.javascriptkit.com"

var searchaction=[
    "http://www.google.com/search",
    "http://kr.search.yahoo.com/search",
    "http://search.msn.co.kr/results.aspx"
]

var queryfieldname=["q","p","q"]

function switchaction(cur, index){
    cur.form.action=searchaction[index]
    document.getElementById("hiddenquery").name=queryfieldname[index]
}

function jksitesearch(curobj){
    for (i=0; i< document.jksearch.se.length; i++){
    if (document.jksearch.se[i].checked==true)
        switchaction(document.jksearch.se[i], i)
    }
document.getElementById("hiddenquery").value=curobj.qfront.value
}
</script>