New to javascript here. I have a form with a series of "Yes/No" radio buttons and I tried making a function to disable the "Submit Form" button if the radio buttons are either, at anytime:

1. If one or more radio buttons are not actively selected
2. If one or more radio buttons have 'No' is selected

If all 4 radio buttons have 'Yes' is selected then the 'Submit Form' button should be enabled `disabled=false`. 

I'm really trying to understand but I don't think I'm achieving the effect I want.

I must use javascript only (I'll be learning jQuery later on) for this. Any help for me to understand would be appreciated.

Thank you.

```js
function Check(e) {
  var button = document.getElementById("submit");

  if (button.disabled == true) {
    button.disabled = false;
  } else {
    button.disabled = true;
  }
}
```

```html
<form>
  <input type="datetime-local">
  <br>

  <input name="Q1" type="radio" value="yes" onclick="Check(this)" required>Yes
  <input name="Q1" type="radio" value="no" required>No
  <br>

  <input name="Q2" type="radio" value="yes" onclick="Check(this)" required>Yes
  <input name="Q2" type="radio" value="no" required>No
  <br>

  <input name="Q3" type="radio" value="yes" onclick="Check(this)" required>Yes
  <input name="Q3" type="radio" value="no" required>No
  <br>

  <input name="Q4" type="radio" value="yes" onclick="Check(this)" required>Yes
  <input name="Q4" type="radio" value="no" required>No
  <br>

  <button id="submit" type="submit" name="submit" disabled>
    SUBMIT FORM
  </button>
</form>
```