I have the following two fields on an HTML form:

```
<input type="hidden" name="Valid" id="Valid" value="True">

<input type="text" id="Address">

```

I need a JavaScript method that will disable the `address` input if the value of the `valid` input is true.

What can I use to do this, please?

I think I need a way of toggling `disabled` on the `Address` input form.