Problem mit SwoopIt bzw. Snapr Plugin.

function Swoopit_insert($content = '') {
        global $swoopit_data;
        
        if ($swoopit_data == 'yes'){
            if (function_exists('str_ireplace')) {
                $content = str_ireplace('href="http://','class="previewlink" href="http://',$content);
                $content = str_ireplace('class="previewlink" href="' . get_settings("siteurl"),'href="' . get_settings("siteurl"),$content);
            } else {
                $content = str_replace('href="http://','class="previewlink" href="http://',$content);
                $content = str_replace('class="previewlink" href="' . get_settings("siteurl"),'href="' . get_settings("siteurl"),$content);
            }
        } 
        else
        {
            if (function_exists('str_ireplace')) {
                $content = str_ireplace('href="http://','class="previewlink" href="http://',$content);
                $content = str_ireplace('class="previewlink" href="' . get_settings("siteurl"),'href="' . get_settings("siteurl"),$content);
            } else {
                $content = str_replace('href="http://','class="previewlink" href="http://',$content);
                $content = str_replace('class="previewlink" href="' . get_settings("siteurl"),'href="' . get_settings("siteurl"),$content);
            }
        }
        return $content;
        
}

<?php
/*
Plugin Name: SwoopIt Plugin
Plugin URI: http://www.swoopit.de/
Description: SwoopIt Plugin integriert das <a href="http://www.swoopit.de">SwoopIt</a>-Script das Wordpress Blog und f&uuml;gt eine Vorschau zu externen Links ein.
Version: 1.00
Author: Norbert Bartels
Author URI: http://www.swoopit.de
*/


/*
Anleitung:


Kopiere den Kompletten Ordner "Swoopit_Plugin" mit allen Dateien
in das wordpress Plugin Verzeichnis "/wp-content/plugins/" und
aktiviere das Plugin im Admin-Bereich.


*/


$swoopit_data = get_option('swoopit_data');




if ('insert' == $_POST['action'])
{
    update_option("swoopit_data",$_POST['swoopit_data']);
}




function Swoopit_option_page() {
    $swoopit_data = get_option('swoopit_data');
    ?>


<!-- Optionen im Adminbereich -->
        <div class="wrap">
          <h2>Optionen f&uuml; SwoopIt</h2>
          Wenn "Permanent aktiv" auf <strong>"Ja"</strong> gesetzt ist, wird dieses Plugin die SwoopIt Vorschau f&uuml;r jeden externen Link einbinden.<br/><br/>
          W&auml;hle <strong>"Nein"</strong>, um die Vorschau manuell f&uuml;r jeden Link einzeln zu aktivieren. Du musst dann zu jedem Link-Tag <br/>
          <code><i>class="previewlink"</i></code> hinzuf&uuml;gen.<br/><br/>
          <form name="form1" method="post" action="<?=$location ?>">
              <table>
                  <tr style="vertical-align:middle;">
                                    <td width="150">Permanent aktiv:</td>
                                    <td style="vertical-align:left;">
                                        <select name="swoopit_data" id="swoopit_data">
                                  <option <?php if(get_option('swoopit_data') == 'no' || '') { echo 'selected'; } ?> value="no">Nein</option>
                                            <option <?php if(get_option('swoopit_data') == 'yes') { echo 'selected'; } ?> value="yes">Ja</option>
                                        </select>
                        <input name="action" value="insert" type="hidden" />
                    </td>
                </tr>
              </table
              <p><div class="submit"><input type="submit" value="Speichern"  style="font-weight:bold;" /></div></p>
          </form>
        </div>


<?php
} // End Swoopit_option_page()


// Adminmenu Optionen
function Swoopit_add_menu() {
      add_options_page('Swoopit Plugin', 'Swoopit', 9, __FILE__, 'Swoopit_option_page'); 
}




function Swoopit_header() {
        $Swoopit_pluginpath = get_settings('home')."/wp-content/plugins/Swoopit_Plugin/";
    
        $SwoopitHead = "\n<!-- Swoopit Plugin -->\n";
        $SwoopitHead.= "<script type=\"text/javascript\">var bubbleImagePath=\"".$Swoopit_pluginpath ."bg.png\"</script>\n";
        $SwoopitHead.= "<script type=\"text/javascript\" src=\"". $Swoopit_pluginpath ."previewlink.js\"></script>\n";
        $SwoopitHead.= "<!-- /Swoopit Plugin -->\n";
        print($SwoopitHead);
}




function Swoopit_insert($content = '') {
        global $swoopit_data;
        
        if ($swoopit_data == 'yes'){
            if (function_exists('str_ireplace')) {
                $content = str_ireplace('href="http://','class="previewlink" href="http://',$content);
                $content = str_ireplace('class="previewlink" href="' . get_settings("siteurl"),'href="' . get_settings("siteurl"),$content);
            } else {
                $content = str_replace('href="http://','class="previewlink" href="http://',$content);
                $content = str_replace('class="previewlink" href="' . get_settings("siteurl"),'href="' . get_settings("siteurl"),$content);
            }
        } 
        return $content;
        
}


// Head-Action
add_action('wp_head', 'Swoopit_header');
add_action('the_content', 'Swoopit_insert');
add_action('admin_menu', 'Swoopit_add_menu');
?>