Metti questo codice in un file Javascipt esterno e poi linkalo alla pagina html in cui devi far comparire l'swf:

document.write('<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0" width="580" height="233">');
document.write('<param name="movie" value="flash/ibwai.swf" />');
document.write('<param name="quality" value="high" />');
document.write('<embed src="flash/ibwai.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="580" height="233"></embed></object>');

inserendo il percorso del tuo swf.

Saluti,
Piero.