Problem solved!

I leave here the solution bplex sent me, so everybody may benefit:

As he told before, It is a parameter
Here is the example:

<object width="480" height="350" type="application/x-shockwave-flash" data="http://www.mywebsite.com/main/player/player.swf"><param name="movie" value="http://www.mywebsite.com/main/player/player.swf"><param name="allowfullscreen" value="true"><param name="flashvars" value="&file=http://www.mywebsite.com/main/flvideo/1227190362701587644.flv&height=350&image=http://www.mywebsite.com/main/thumb/16.jpg&width=480&location=http://www.mywebsite.com/main/player/player.swf&logo=http://www.mywebsite.com/main/templates/images/watermark.gif&link=http://www.mywebsite.com&linktarget=_blank"/></object>

Thank you , bplex