<SCRIPT LANGUAGE="JavaScript">
<!--
var checkflag = "false";

function check(field) {
    if (checkflag == "false") {
        for (i = 0; i < field.length; i++) {
            field[i].checked = true;}
            checkflag = "true";
        return "Uncheck All"; }
    else {
        for (i = 0; i < field.length; i++) {
            field[i].checked = false; }
            checkflag = "false";
        return "Check All"; }
}
// -->
</script>

<form name=myform action="" method=post>
<input type=checkbox name=list value="1">www.blueb.co.kr<br>
<input type=checkbox name=list value="2">www.naver.com<br>
<input type=checkbox name=list value="3">www.yahoo.com<br>
<input type=checkbox name=list value="4">www.daum.net<br>
<input type=checkbox name=list value="5">www.nate.com<br>
<input type=button value="Check All" onClick="this.value=check(this.form.list)">
</form>