New plugin fatal error

Hello there,

I’m new in making a widget for WP. But everything went well until I wanted to activate the plugin. I’m getting a fatal error at the <h3 style="padding-left:14px;background:#ebebeb;"> line Here is my code:

<?php
/*
Plugin Name: Twitter Search
Description: Search on Twitter
Author: Nick MDC
Version: 1
Author URI:
*/

  // Initialization function
  function WP_Widget_searchtwitter_init()
  {
    new WP_Widget_searchtwitter();
  }

  // Your Class
  class WP_Widget_searchtwitter extends WP_Widget
  {
    // Constructor
	function WP_Widget_searchtwitter()
	{
	  $widget_ops = array('description' => __('Search on Twitter', 'searchtwitter'));
	  $this->WP_Widget('searchtwitter', __('Searchtwitter'), $widget_ops);
	}

	// Display Widget
	function widget($args, $instance) {
		extract($args);
		$title = attribute_escape($instance['title']);
		echo $before_widget.$before_title.$title.$after_title;
		searchtwitter();
		echo $after_widget;
	}

	// When Widget Control Form Is Posted
	function update($new_instance, $old_instance)
	{
		if (!isset($new_instance['submit']))
		{
			return false;
		}
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		return $instance;
	}

    /* Your custom code starts here */
	/* ---------------------------- */

	/* Your Function */
	function searchtwitter()
	{

	  /* Your Code ----------------- */ 

	  <h3 style="padding-left:14px;background:#ebebeb;">

        <a name="widget"></a>

        <?php

			if(isset($_POST['sw-search-terms'])){
				$_SESSION['search_terms'] = $_POST['sw-search-terms'];
			} else {
				if(isset($_SESSION['search_terms'])){

				} else {
					$_SESSION['search_terms'] = 'svbinteractive';
				}
			}

		?>

		<form action="<?php echo $PHP_SELF; ?>#widget" method="post">
        <p valign="middle">
		  <input type="text" onclick="this.value='';" style="margin-bottom:6px;" class="formclass" size="27" value="<?php echo $_SESSION['search_terms']; ?>" name="sw-search-terms" id="sw-search-terms">

          <input type="image" style="margin-bottom:6px;margin-top:3px;" class="labelleft" src="./wp-content/themes/svb/images/zoeken.png" value="" />
		</p>
		</form>

        </h3>
        <script src="https://widgets.twimg.com/j/2/widget.js"></script>
<script>
new TWTR.Widget({
  version: 2,
  type: 'search',
  search: document.getElementById('sw-search-terms').value,
  interval: 6000,
  title: 'Wat hebben de mensen te zeggen over:',
  subject: document.getElementById('sw-search-terms').value,
  width: 270,
  height: 300,
  theme: {
    shell: {
      background: '#8ec1da',
      color: '#ffffff'
    },
    tweets: {
      background: '#ffffff',
      color: '#444444',
      links: '#1985b5'
    }
  },
  features: {
    scrollbar: false,
    loop: true,
    live: true,
    hashtags: true,
    timestamp: true,
    avatars: true,
    behavior: 'default'
  }
}).render().start();
</script>

	  /* End of Your Code ---------- */

	}
  }

  add_action('widgets_init', 'WP_Widget_searchtwitter_init');

?>

Thanks in advance.