Javascript, probably this stuff (found simply by doing a "view source" of the page):
<script type="text/javascript" charset="UTF-8">YAHOO.Lifestyles.ImageLoader.delayByView({el:"ylf-ch-L2", cl:"lz", imgs:["http://l.yimg.com/jn/util/anysize/92*110c-86400,http%3A%2F%2Fus.f10.yahoofs.com%2Fphugc%2FR7SDUwHdnGaH%2Fphotos%2F52f4e847ddfc983445d02ba2df07f45a%2Fmr_c357fa9655e3ea.jpg%3Fug_____DZwChyguS"]});</script>
View the <head> section of the document for the <script> tag that downloads a JavaScript file, and you'll probably find that file has the necessary functions/objects in it.