Losing the Button, Part One

Brewster's Law of HTML Forms: every input field cuts the chance that the user will complete the form in half. Yes, the Submit button is an input field.
This is especially important in on-page interactions like this one; the user lives in fear that if he clicks the button, he's going to go somewhere else.
We want the user to use the thing, so let's deep-six the button. Cut this line from structure.html:
```
<button>Go!</button>
```
In behavior.js, remove this:
```
$.b.onmouseup = function() { this.doStuff(); };
```
... and substitute this:
```
$.q.value = '';
$.lastQuery = '';
setInterval(SEARCH.doStuff, 1000);
```
$.lastQuery is a private variable that will hold the previous query. doStuff will run every second, which is plenty of time for people to type. And we need to set $.q.value to nothing on load, or else it can get really annoying for repeat visitors.
Don't run it yet; there's a bit more to do!