Javascript :: Script Not Allowing Lightbox To Cover Embedded Youtube Videos?

I had problems covering videos on Youtube itself but solved that with a design change (don't need to cover them any more).

So I have a script the user can run and it calls a javascript file to do other stuff on the current webpage. One thing it does is bring up a lightbox that covers the page. Of course it won't cover embedded Youtube videos and so I need to do a few changes. I did the necessary changes and it didn't work. I kept trying and trying and eventually made a page with just an embedded video and a .jpg (my script won't run if there are no images).

I looked to see what the Pinterest script added to the embedded video portion and while it was almost identical they did have an autoplay=0 in there so I added it just so I could see for myself that it is exactly the same. If I run the Pinterest script and close it, then run mine, mine works fine. If I run mine, then the Pinterest script, then mine again, mine works. So I believe this means I'm not adding anything that tells the page "Go ahead and put the video on top anyway."

My portion of the script that adds the wmode:

var players = document.getElementsByTagName('embed');
var len = players.length;
for(var i=0;i<len;i++){

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