PHPSESSID messed up form!

[Alex Shi]

Hi,

I don't know how php process its session. I just noticed that
for the first time a web site is loaded php will insert a
PHPSESSID through out the page: it attach this id to links,
insert hidden field into form, and even attach the id onto
form button if the button is an image. Here are samples
what it did:

<a href="http://link?PHPSESSID=e2b49283217665659a856cd939f10881>

<input type="image" border="0" name="login" value="Login"
src="buttons/login.gif?PHPSESSID=e2b49283217665659a856cd939f108 81"
width="62" height="22">

<input type="hidden" name="PHPSESSID"
value="e2b49283217665659a856cd939f10881" />

My form submit to a third party API and PHPSESSID made
form behaving very strange! How can I get rid of it?
Thanks in advance!

Alex Shi