Text editors

hi people,
long time has passed since we had that problem in 1.4.3. then, it was enough to add the iframe, object, embed tags to the allowed ones in weblib.php
i tried the same in my 1.7 installation at galeinai.net, but the results were errors in dmllib.php and weblib.php, and the forum stopped to work.
i'm trying to do something innocent: i want to embed videos in one forum, to have it working as a vodcast-alike.
the code I inserted was: "
(center)(embed style="width:400px; height:326px;" id="VideoPlayback" type="application/x-shockwave-flash" src="http://video.google.com/googleplayer.swf?docId=-92892846090506216&hl=en" flashvars="")(/embed)(br)YodTeth Kislev 5767- Hisvaadus Rav Yitzchak Ginsburgh shlit"a in Jerusalem - part 3 (/center)" --- (i'm sustituing <> for () with the hope of having this code displayed here.
but when I see the post, it only has the text portion; when I edit it, all the (embed)(/embed) has dissapeared.
please, what do I have to change in any configuration file to have the possibility of embedding in my forum posts enabled?
thanx in advance,

daniEl