Help me validate my forum

[Mijae]

I am getting 95 errors

http://validator.w3.org/check?uri=ht...orum/index.php

Tell me where to start, and how

EDIT: Got down to 83 errors I can't get it lower
EDIT 2: Got down to 67 errors

What in gods name is general entity "threadid" not defined and no default entity and reference not terminated by REFC delimiter, like 50 of the errors come from those! I dont even know what that is :P

EDIT 3: Down to 25 errors, 32 errors were due to a missing amp; :speechless:

EDIT 4: Down to 19 errors, one mine (can't figure it out), and 18 from a tracked I use (eXtremetracking). Also, showthread.php has gotten from 270+ to 20 errors now.

Wow. This turned out to be fun :P

EDIT 5: Fixed table issue by removing thead

EDIT 6: AT LAST! This Page Is Valid XHTML 1.0 Transitional!

EDIT 7: How can I make this XHTML compliant?

<a target="_blank" href="http://t.extreme-dm.com/?login=ivtrack"><img src="http://u1.extreme-dm.com/i.gif" height=1 border=0 width=1 alt=""></a><script language="javascript1.2"><!--
EXs=screen;EXw=EXs.width;navigator.appName!="Netscape"?
EXb=EXs.colorDepth:EXb=EXs.pixelDepth;//-->
</script><script language="javascript"><!--
EXd=document;EXw?"":EXw="na";EXb?"":EXb="na";
EXd.write("<img src=\"http://t0.extreme-dm.com",
"/0.gif?tag=ivtrack&j=y&srw="+EXw+"&srb="+EXb+"&",
"l="+escape(EXd.referrer)+"\" height=1 width=1>");//-->
</script><noscript><img height=1 width=1 alt=""
src="http://t0.extreme-dm.com/0.gif?tag=ivtrack&j=n"></noscript>

I did everything the validator told me and I ended with java errors

On a side note, what does amp; do? Does it break anything? I am adding amp; everywhere the validator tells me to. Will it break the forum links? Altho so far it works, I am afraid of doing what I do.