Sådan ?-)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd"><html>
<head>
<title>Disable select</title>
<meta name="keywords" content="søgeord adskilt af komma">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<br>
<form id="minForm" name="minForm">
<input id="minCheck" name="minCheck" type="checkbox" onclick="this.form.minSelect.disabled=this.checked">
<br>
<select name="minSelect" id="minSelect" onchange="udskift(this,this.form);">
<option value="">-- Vælg her --<br>
<option value="ae">æ<br>
<option value="<et t>">t<br>
<option value=">">><br>
</select>
<br>
</form>
</body>
</html>