how to pause an embedded video

hello i got a code just like this:

var youtubevid = $("<iframe/>");
     sym.$("vcontainer").empty().append(youtubevid);
     youtubevid.attr('type','text/html');
     youtubevid.attr('width','425');
     youtubevid.attr('height','350');

     youtubevid.attr('src','http://www.youtube.com/embed/ykF1y2EJ2nI');  // url/Video_Id
     youtubevid.attr('frameborder','1');       // 1 | 0
     youtubevid.attr('allowfullscreen','0');   // 1 | 0

and i want to pause this whith an button but how?