Input and Output

If the previous step worked, you have a yellow screen with "Hello, World!" and an alert box that says "ding!" when you load the page.
Let's make it more interesting. Go back to structure.html, remove the line that says Hello, World and substitute this:
```
<input id="q" />
<button id="b">Go!</button>
```
In behavior.js, remove the line that says SEARCH.doStuff(); and substitute this:
```
$.q = document.getElementById('q');
$.b = document.getElementById('b');
$.b.onmouseup = function() { SEARCH.doStuff(); };
```
Here we are adding two new members to the $ object we declared as a private variable; these will be available throughout the app for as long as the page is running. We're also capturing onmouseup on the button.
Finally, change alert('ding'); to alert($.q.value);
Save everything, reload, enter something in the blank, and click the button.
Do you see what you entered in the alert box?