F.eks. sådan:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd"><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
html,body{height:100%;margin:0px;border:0px;padding:0px;font-family:tahoma,verdana,arial,sans-serif;font-size:small;}
</style>
<script type="text/javascript">
function checkAllMsgs(elm){
var inps = elm.form.getElementsByTagName('input');
for(i=0;inps.length>i;i++){
if(inps[i].type == 'checkbox' && inps[i].name.indexOf('besked') == 0)
inps[i].checked = elm.checked;
}
}
</script>
<title>Check alle (selektivt)</title>
</head>
<body>
<br>
<form id="minForm" name="minForm">
<br>Check alle beskeder<input type="checkbox" name="checkAll" onclick="checkAllMsgs(this)">
<br>Besked 1<input type="checkbox" name="besked1">
<br>Besked 2<input type="checkbox" name="besked2">
<br>Besked 3<input type="checkbox" name="besked3">
<br>Besked 4<input type="checkbox" name="besked4">
<br>Besked 5<input type="checkbox" name="besked5">
<br>Ønsker besked ved nye indlæg<input type="checkbox" name="nyeIndlaeg">
</form>
</body>
</html>