var playerVersion = $.swfobject.getFlashPlayerVersion(); // returns a JavaScript object
var majorVersion = playerVersion.major; // access the major, minor and release version numbers via their respective properties
var minorVersion = playerVersion.release; // access the major, minor and release version numbers via their respective properties

//alert('largeur : '+largeurflash+', hauteur + '+hauteurflash);
if((majorVersion==8) || (majorVersion==9 && minorVersion<48)){
$.swfobject.embedSWF("/flash/myplayer8.swf", "contenuflash", largeurflash, hauteurflash, "8.0.0", "/flash/expressInstall.swf", flashvars, params, attributes);
}
else{
$.swfobject.embedSWF("/flash/myplayer9.swf", "contenuflash", largeurflash, hauteurflash, "9.0.48", "/flash/expressInstall.swf", flashvars, params, attributes);
}