The flying gold string was left there by the spider to induce its prey. Please use your mouse tip to touch the string ( You have to be patient in doing this :-)). You could possibly guess that the spider would come out to catch the induced prey.
Here, the route of the spider is regulated in such a way to immitate the spider's foxy and careful manner.
What more can dhtml do? Please click the big spider or the index above to go the next example.