<html>
<head>
<script language=
'JavaScript'>
checked = false;
function checkedAll
() {
if (checked == false
){checked = true
}else
{checked = false
}
for (var i = 0; i < document.getElementById
('myform').elements.length; i++
) {
document.getElementById
('myform').elements[i].checked = checked;
}
}
</script>
</head>
<body>
<form id=
"myform">
<input type=
"checkbox" name=
"foo"/>
<input type=
"checkbox" name=
"bar"/>
<BR>Označiť / odznačiť všetko: <input type=
'checkbox' name=
'checkall' onclick=
'checkedAll();'>
</form>
</body>
</html>