why can i not crawl this website with simple html dom parser(php)?

http://www.yes24.com/Product/Goods/105359770

I want to crawl this tag enter image description here
but I can’t find div id=”yDetailBotWrap” with simple html dom parser.
$html->find('div[id=yesWrap]', 0) works well but
$html->find('div[id=yesWrap]', 0)->find('div[id=yDetailBotWrap]', 0) returns null.

how can i crawl this ?