<script language="javascript">
function getkey(e)
{
if (window.event)
   return window.event.keyCode;
else if (e)
   return e.which;
else
   return null;
}
function kodeScript(e, goods, field)
{
var key, keychar;
key = getkey(e);
if (key == null) return true;

keychar = String.fromCharCode(key);
keychar = keychar.toLowerCase();
goods = goods.toLowerCase();

// check goodkeys
if (goods.indexOf(keychar) != -1)
    return true;
// control keys
if ( key==null || key==0 || key==8 || key==9 || key==27 )
   return true;

if (key == 13) {
    var i;
    for (i = 0; i < field.form.elements.length; i++)
        if (field == field.form.elements[i])
            break;
    i = (i + 1) % field.form.elements.length;
    field.form.elements[i].focus();
    return false;
    };
// else return false
return false;
}
</script>