Question: Is there a way to disable multi select?

Answer: 
with this code you can disable multiselect:

```
document.getElementById('mySelectBox').removeAttribute("multiple");;

```

... of a selectbox like this:

```
<select multiple="multiple" id="mySelectBox">
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>        
</select>

```

(not tested)
```
<select multiple="multiple" size="3">
    <option value="1" disabled>One</option>
    <option value="2" disabled>Two</option>
    <option value="3" disabled>Three</option>
</select>

```