swfobject.embedSWF not working in Drupal 6

Hi
i've this code in a test.html page

swfobject.embedSWF("player.swf",
"myplayer", "500", "220",
"9.0.0", false, flashvars, params, attributes);

which works perfectly.
As soon as I put it (including declarations of swfobject.js...) in a simple Drupal Node, or in a View, it is not working. My player.swf (JW Player) is not replaced nor displayed in my div 'myplayer'.
I've tried to move swfobject.js and player.swf at the root, then to give their full path at http://localhost..., I tried to include it in php with url() function. Nothing. It seems yet that the path is involved.
Do I miss something ? What could I do
Plz help, it drives me crazy from 10 days...