WP动态特色图片 - 无法获得第二个特色图片网址

I'm actually working on a wordpress website with a Dessign.net theme (the pixel one) which got a beautiful full-page slider on the front page. The slider shows the featured image of selected posts (post for which i've checked "show in slideshow" in the meta box field on edit page).I'm actually working on a wordpress website wit