Re: how to put document.getElementById("sidebar").innerHTML ETC into an ECHO

I would look at the quotes (especially given the error message you
report). I would expect that PHP would be as unhappy about nested
quotes as every other programming language.
You probably need to do something like:
echo "var document.getElementById('sidebar').innerHTML =
('sidebar_html');\n";
(notice the change to single quotes inside the string).

-- Larry
(disclaimer, I don't know much about PHP, which is what the code looks
like it is written in)