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Notice that you can (just like with jQuery), grab a element and manipulate it.
<div id="order-form">
<form>
<label>Your Name:<label>
<input />
<label>Email<label>
<input type="email" />
<label>Subject</label>
<input type="text" />
<label>Message<label>
<textarea rows="3" cols="50"></textarea>
<input type="submit" value="Send Message" />
</form>
</div>
var orderForm = document.getElementById("order-form");
orderForm.hidden = true;
orderForm.click(function () { alert("hello"); });
// etc