Mix of 2 videos from youtube : Try try try to understand

PRE-LOADING videos for PERFECT SYNCHRONIZATION
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Youtube 1: XX% | OK - Ready
Youtube 2: 00% | Initializing...

x
This message will close automatically when all the videos will be ready.
Videos will restart together from their starting position.

If necessary, click to stop synchronization and close this windows.

See another Mashup !

Youtube URL 1 :	Start (secs) :	Volume (0-100) :
Youtube URL 2 :	Start (secs) :	Volume (0-100) :
Youtube URL 3 :	Start (secs) :	Volume (0-100) :
Youtube URL 4 :	Start (secs) :	Volume (0-100) :
Youtube URL 5 :	Start (secs) :	Volume (0-100) :
Youtube URL 6 :	Start (secs) :	Volume (0-100) :
Youtube URL 7 :	Start (secs) :	Volume (0-100) :
Youtube URL 8 :	Start (secs) :	Volume (0-100) :

Title of Mashup (20-100 char. required) :	Giving an appropriate title to your set will help internet users to find it .. and so to see it.
Your name (optional) :	For easier future searches, put a username.
This mashup needs perfect synchronization :	A pre-loading function will be automatically applied.
Please copy these numbers (required) :