function start_video_playback(nId)
        {
            var image                   =   document.getElementById('overlay_' + nId);
            var myytplayer              =   document.getElementById('player_' + nId);
            image.style.visibility      =   'hidden';
            myytplayer.style.visibility =   'visible';
            myytplayer.style.top        =   '0px';
            try
            {
                myytplayer.playVideo();
            }
            catch (e) {}
        
        }
        function HidePlayer(nId)
        {
            var image                   =   document.getElementById('overlay_' + nId);
            var myytplayer              =   document.getElementById('player_' + nId);
            myytplayer.style.visibility =   'visible';
            myytplayer.style.top        =   '-1000px';            
            image.style.visibility      =   'visible';
        }
        function ResizePlayer(nId, sWidth, sHeigth, sLeft)
        {
            if (document.getElementById('overlay_' + nId).style.visibility!='hidden')
                return;
            var myytplayer  =   document.getElementById('player_' + nId);
            myytplayer.style.width=sWidth + 'px';
            myytplayer.style.height=sHeigth +'px';
            myytplayer.style.left=sLeft +'px';
        }