I go here http://developer.yahoo.com/yap/guide/examples/dynamicheightwidth.html and i see YAP.publish and YAP.events used with this instruction, but I get this error not found: YAP in my catch when I try to use YAP.publish on my own. I tried to search yahoo documentation but I dont see where these methods are mentioned? please help. YAP.publish(new YAP.events.ViewportChanged({height: minHeight, width: minWidth}));