PHP redirection problem in IE when using session variables

[ravin1234]

I have a small website that works like below\[code\]1) User goes to the login page and enters the credentials (call it page1)2) The form gets posted to page2, which authenticates the user, calls session_start and then sets a session variable with $_SESSION['somevar'] and redirects to the page33) On page3 , I check if the $_SESSION['somevar'] is set if not send the user back to the login page //here's the code on the top of the page3 <?php session_start(); if (!isset($_SESSION['somevar'])) { header("Location:http://somesite") } ...other code follows\[/code\]The problem is while this works in FireFox, even with correct user credentials IE 7 keeps on redirecting back to page1 instead of displaying the contents of page3.Some pointer please to solve this?EDIT : A very weird solution but it works. I changed \[code\] if (!isset($_SESSION['somevar'])) { header("Location:http://somesite") }\[/code\]to\[code\] if ($_SESSION['somevar'] == '' ) { header("Location:http://somesite") }\[/code\]and IE is happy now. But I am still clueless as to why \[code\]isset\[/code\] didn't work in IE Many Thanks