Error Message - Need help troubleshooting

Hello List. I have some JS code that open a new window with a contact form in it. When the link is clicked to open the new window, I will get the following error SOMETIMES: "Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0" My JS code with a bit of PHP in it looks like this: function loadOSS() var oss_itemid = "<?php echo $item_id; ?>"; var loadOSS = window.open("my_url/my_file.php?iid=" + oss_itemid, "", "scrollbars=no,menubar=no,height=600,width=600,resizable=yes,toolbar=no,location=no,status=no"); } As I said above, the error message does not always appear. Is the error due to the fact I am JS & PHP together? Any help in understanding what I am doing wrong is appreciated. --Rick