<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd"><html>
<head>
<title>Tæl checkboxe</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language="javascript" type="text/javascript">
var x = 0;
function showCheckNumber(){
document.getElementById('minSpan').innerHTML="Ialt <b> "+x+" </b> checkboxe afkydset"
}
</script>
</head>
<body>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<input type="checkbox" onclick="x+=(this.checked)?1:-1;showCheckNumber()"><br>
<br>
</form>
<span id="minSpan">En span-tekst</span>
</body>
</html>