title: ReferenceError: className is not defined
body: <p>In my rails app that is using reactjs I have coffescript code that looks like this:</p>
  
  <pre><code>DOM = React.DOM
  
  CreateNewMeetupForm = React.createClass
    getInitialState: -&gt;
      {
        title: ''
        description: ''
      }
  
    titleChanged: (event) -&gt;
      @setState(title: event.target.value)
  
    descriptionChanged: (event) -&gt;
      @setState(description: event.target.value)
  
    render : -&gt;
      DOM.form
        className: 'form-horizontal'
        DOM.fieldset null,
          DOM.legend null, "New Meetup"
  
          DOM.div
            className: 'form-group'
            DOM.label
              htmlFor: 'title'
              className: 'col-lg-2 control-label'
              'Title'
  
            DOM.div
              className: 'col-lg-10'
              DOM.input
                className 'form-control'
                placeholder: 'Meetup title'
                id: 'title'
                type: 'text'
                value: @state.title
                onChange: @titleChanged
  
          DOM.div
            className: 'form-group'
            DOM.label
              htmlFor: "title"
              className 'col-lg-2 control-label'
              'Description'
            DOM.div
              className "col-lg-10"
              DOM.input
                className 'form-control'
                placeholder: 'Meetup description'
                id: 'description'
                type: 'text'
                value: @state.description
                onChanage: @descriptionChanged
  
  CreateNewMeetupForm = React.createFactory(CreateNewMeetupForm)
  
  $ -&gt;
    React.render(
      CreateNewMeetupForm(),
      document.body
    )
  </code></pre>
  
  <p>It returns me following error:</p>
  
  <pre><code>ReferenceError: className is not defined
  </code></pre>
  
  <p>How can I fix that?</p>