Hola creo haver encontrado la solucion gracias a los enlaces que me pasaste, leyendo mire que solo era necesario agregar la variable en ambos OBJECT y EMBED como lo explican aki abajo:
All browsers will support string sizes of up to 64KB (65535 bytes) in length. FlashVars must be assigned in both the OBJECT and EMBED tags in order to work on all browsers.
Object Tag Example:
<PARAM NAME=FlashVars VALUE="foo=Hello%20Worldgraph=first+line%0Dsecond+ line">
Embed Tag Example:
<EMBED href="display.swf" FlashVars="foo=Hello%20Worldgraph=first+line%0Dsec ond+line" ... (other parameters)></EMBED>
Encoding of this string is the same as the page containing it. Internet Explorer is responsible for providing UTF-16 compliant string on a Windows platform. Likewise, Netscape will provide a UTF-8 encoded string to the player.
http://kb2.adobe.com/cps/164/tn_16417.html
Gracias...