bunlar için eklenti kullanmak suçtur bence zaten.

yazı eklerken görsel değil, metin editörü kullanarak aşağıdaki kodları kullan:

SWF İÇİN:

<OBJECT CLASSID="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
WIDTH="850"
HEIGHT="610"
CODEBASE="http://active.macromedia.com/flash5/cabs/swflash.cab#version=5,0,0,0">
<PARAM NAME="MOVIE" VALUE="2bigpinkballs2.swf">
<PARAM NAME="PLAY" VALUE="true">
<PARAM NAME="LOOP" VALUE="true">
<PARAM NAME="QUALITY" VALUE="high">
<PARAM NAME="SCALE" value="noborder">
<EMBED SRC="2bigpinkballs2.swf"
WIDTH="850"
HEIGHT="610"
PLAY="true"
LOOP="true"
QUALITY="high"
scale="noborder"
PLUGINSPAGE="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"> 
</EMBED>
</OBJECT>

YOUTUBE İÇİN

<iframe width="560" height="315" src="http://www.youtube.com/embed/[B]tX5nhT5zklg[/B]?rel=0" frameborder="0" allowfullscreen></iframe>

video ID'yi değiştirerek tabii.
http://i.imgur.com/mAJy4V4.png