Older Browsers, SID, & PHP4.0

Hello all, I have just rolled out an application with session id's (my own function , not php4.0 session id's) that are passed in the URL. Unfortunately, some of my users with older browsers, specifically under IE 4.02, (I don't know about Netscape) are having problems with one specific part of the site. In an area where they can update some information, upon submit, the session id is being modified and their session is terminated on the very next page load. I have a user log page to track the login and logout of the users. The tag "Bad Ses" represents someone getting kicked out because they tried to use a bad session id. Of particular interest is the "®is" symbol at the end, although this does not show up on every "Bad Ses". Is anyone familiar with why this is occuring. My solution so far has been to tell the users to download the latest version of their browser; it is free after all. However, I wouldn't mind putting in a patch so I will stop getting hassled with emails. Date User Session Action 2000-09-20 11:52:03 3k5Dom2AKOcN®is Bad Ses 2000-09-20 11:50:48 User1 3k5Dom2AKOcN LOGIN Thanks in advance for any suggestions, Paul