set global working??

Not quite a mystery, but I wondered if anyone could throw a couple of suggestions my way. My client's websites were moved last year from an old php server to a newer one. At that time, I had to upgrade all her scripts because set_globals were off on the new server, and so I went to using $_SESSION variables. All seemed to be doing fine until sometime last week when the scripts on a new website I am working on, being hosted on her server, started flaking out. Variables were becoming persistent, retaining previous values and refusing to change. I checked the php settings and found that the version running on the sever is 4.1.2 with globals on. That surprised me. I don't have admin access and would be cautious about trying to change this and possibly messing up someone else's site. Anyway, to test my theory, I created a simple script that turns session_start on and off. If session_start is off, variables work fine. With session_start on, variable will change once, and then refuse to change. I've attached the script. Does this indeed mean that I have to go through all my scripts and comment out session_start and convert my $_SESSION defines back?? Yeachh!! Terry <? if($pers) session_start(); // check for persistance if(!$ag) $ag=8; // set as default switch($ag){ case "8": $office="Modesto"; break; case "7": $office="Livermore";break; case "9": $office="Fremont"; break; case "10": $office="San Lorenzo"; break; case "28": $office="Berkeley"; break; case "25": $office="Mountain View"; break; } if($switch) $pers=(!$pers); // switch persistence on/off ?> <div align="center"><font size="5" color="#00015d" face="Verdana"><b><?=$office?></b></font></div></td> <br /> <a href="check.php?ag=<?=$ag?>&pers=<?=$pers?>&switch=1">Switch Persistence <?=$pers?></a> <br /> <a href="check.php?ag=7&pers=<?=$pers?>">Livermore</a> <a href="check.php?ag=8&pers=<?=$pers?>">Modesto</a> <a href="check.php?ag=9&pers=<?=$pers?>">Fremont</a> <a href="check.php?ag=10&pers=<?=$pers?>">San Lorenzo</a> <a href="check.php?ag=28&pers=<?=$pers?>">Berkeley</a> <br />