public static function print_get_params_visibility_field()
        {
            $field_name = 'get_params_visibility';
            printf('<select id="%1$s" name="nelioab_settings[%1$s]" %2$s>', $field_name, self::get_basic_details());
            ?>
				<?php 
            $val = NelioABSettings::GET_PARAMS_VISIBILITY_HIDE_NONE;
            ?>
				<option value='<?php 
            echo $val;
            ?>
'><?php 
            _e('Show All A/B Testing Parameters (including context)', 'nelioab');
            ?>
</option>
				<?php 
            $val = NelioABSettings::GET_PARAMS_VISIBILITY_HIDE_CONTEXT;
            ?>
				<option value='<?php 
            echo $val;
            ?>
'<?php 
            if (NelioABSettings::get_params_visibility() == $val) {
                echo ' selected="selected"';
            }
            ?>
><?php 
            _e('Show This Page A/B Testing Parameter (hide context)', 'nelioab');
            ?>
</option>
				<?php 
            $val = NelioABSettings::GET_PARAMS_VISIBILITY_HIDE_ALL;
            ?>
				<option value='<?php 
            echo $val;
            ?>
'<?php 
            if (NelioABSettings::get_params_visibility() == $val) {
                echo ' selected="selected"';
            }
            ?>
><?php 
            _e('Hide All A/B Testing Parameters', 'nelioab');
            ?>
</option>
			</select>
			<div class="the-descr" style="display:none;"><span class="description"><?php 
            _e('Nelio A/B Testing loads alternative content by adding a few parameters in your URL. In principle, this parameters are visible to your visitors, but you can decide whether they should be hidden or not and, if they should, which ones.', 'nelioab');
            echo '<ul style="list-style-type:disc;margin-left:3em;">';
            _e('<li><strong>Show All Params.</strong> All A/B Testing parameters will be shown.</li>', 'nelioab');
            _e('<li><strong>Hide Context Params.</strong> If you\'re on a tested page (and/or if you\'re running a global experiment, such as a Widget or a Menu experiment), the URL will contain a parameter <code>nab</code> that specifies the alternative to be loaded (and/or another parameter <code>nabx</code> for the global experiment).</li>', 'nelioab');
            _e('<li><strong>Hide All Params.</strong> Once the alternative content has been loaded, all A/B Testing params are removed from the URL.</li>', 'nelioab');
            echo '</ul>';
            ?>
</span></div><?php 
        }