Find and replace bash script?

[rednax]

I need to add a snippet of php code to about 150 'index.html' files on one of my servers...

So far I have this:

for a in $(grep DocumentRoot /etc/httpd/conf/httpd.conf |awk '{print $2}');do sed (not sure here) $a/html/index.html;done

So far this will find every domain I have on the server and give it value 'a'... domain1.org, domain2.org etc

The 'do sed' is the part I need help with. I need to find "</body>" in every index.html file and replace it with:

"<?php 
$GLOBALS['adl_page_prefix']='$a.org';
$GLOBALS['adl_ext_addr']='stats.domain.com';
@include_once $GLOBALS['HTTP_SERVER_VARS']['DOCUMENT_ROOT'].'/twatch_include/extlogger.php';
?>
</body>"

Is this possible? Thanks so much to anyone that can help, will save me a LOT of time

[rednax]

for file in ls /home/webadmin/xander/videos.html ; do
sed -e 's/<\/html>/<\?php 
\$GLOBALS[\'adl_page_prefix\']=\'domain.org\';
\$GLOBALS[\'adl_ext_addr\']=\'stats.domain.com\';
@include_once \$GLOBALS[\'HTTP_SERVER_VARS\'][\'DOCUMENT_ROOT\'].'\/twatch_include\/extlogger.php';
\?>/g' "$file"
echo ----------------------------------------------------------------
done

Did I escape this correctly? Can I even insert php code using sed?