function widget($args, $instance)
 {
     $args['name'] = '';
     MCW_eval_code($args);
 }
    <div width="100%" align="right">
      for plugin options <a href="<?php 
echo get_option('siteurl');
?>
/wp-admin/options-general.php?page=<?php 
echo MCW_get_mainfile_name();
?>
">click here &raquo;</a><br>
    </div>
  </div> 
  
<?php 
if ($_POST[$hidden_field_submit] == 'Y') {
    for ($i = 0; $i < $max; ++$i) {
        if ($_POST[$element_widget_submit . $i] == $button_text_preview_single) {
            if ($_POST[$data_debug_activate] == $data_debug_activate) {
                $args = array('i' => $i, 'name' => $cache_all_widgets[$i]['name'], 'force_eval' => true, 'debug_mode' => true);
            } else {
                $args = array('i' => $i, 'name' => $cache_all_widgets[$i]['name'], 'force_eval' => true, 'debug_mode' => false);
            }
            echo '<div class="wrap"><h2>Preview of widget "' . $cache_all_widgets[$i]['name'] . '"</h2><fieldset class="options"><legend>Look can differ because of different StyleSheets.<div class="mcw_preview">';
            MCW_eval_code($args);
            echo '</legend></fieldset></div></div>';
        }
    }
}
?>