der bär: Radiobuttons checken?

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Hi ich hab jetzt das draus gemacht allerdings funzt es immer noch net

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language="JavaScript">
function check() {
for (i=0; i<document.formularname.radiobuttons.length; i++) {
if(document.form1.radiobutton[i].checked==true) {
return true;
}
else
{
alert('uncheck');
}
}
}
</script>
</head>

<body>
<form name="form1" method="post" action="">
  <input type="radio" name="radiobutton" value="radiobutton">
  <input type="radio" name="radiobutton" value="radiobutton">
  <input type="submit" name="Submit" value="Submit" onClick="return check()">
</form>
</body>
</html>

gruß der bär