Si infatti ho risolto.

Prima di tutto ho usato FlashVars:
Codice PHP:
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="550" height="400" id="variabile" align="middle">
    <
param name="allowScriptAccess" value="sameDomain" />
    <
param name="allowFullScreen" value="false" />
    <
param name="movie" value="variabile.swf" />
    <
param name="FlashVars" value="myURL=http://weblogs.macromedia.com/&myTitle=Macromedia+News+Aggregator">
    <
param name="quality" value="high" />
    <
param name="bgcolor" value="#ffffff" />
    <
embed src="variabile.swf" FlashVars="myURL=http://weblogs.macromedia.com/&myTitle=Macromedia+News+Aggregator" quality="high" bgcolor="#ffffff" width="550" height="400" name="variabile" align="middle" allowScriptAccess="sameDomain" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
</
object
Dopodikè ho inserito le variabili anke tra le variabili del js creato automaticamente da flash, RunActive.