Why does appending an element onto a YouTube chromeless div cause it to flash with jQuery?

I'm trying to append a <div> with some controls in it onto my chromeless youtube container with jQuery when a user hover's over the player, but it causes the player flash black and white.

$("#lol").appendTo("#ytplayerid");

I'm trying to go for a similar effect to this: http://demo.tutorialzine.com/2010/07/youtube-api-custom-player-jquery-css/youtube-player.html

Could be something to do with z-index. Perhaps set the z-index on the player element to 1000 and then set it lower on the div. Be sure to set position on the elements to apply the z-index.