Description:
------------
There is an htmlentities glitch. If you have a message in a textarea box, and you use </textarea>, it allows html after that to be parsed on a message preview screen if there is one.

Reproduce code:
---------------
$input=htmlentities($input);

Expected result:
----------------
I can't really give you a code without giving out my entire message screen, let's just say that with this textarea box I'm typing in right now, if I decide to type in </textarea>, and then something like <marquee>glitch</marquee>, the <marquee> would be parsed at the bottom of the screen. My expected result is to not have this happen.

Actual result:
--------------
Of course, the actual result is allowing html after the </textarea> to be parsed. If someone used

</textarea>
<!#cmd.execute="[database query]">

Then it would allow a db query to execute on servers if asp is mixed with php code. This is a dangerous problem, and needs a fix. All I'm saying is that htmlentities() needs to be allowed to block </textarea> for things like message previews.