function session-start error

This does not happen everytime I go to my page and I notice it only with my IE browswer.

I have an external page checking for aMember log in. When the homepage loads, i get the following error:

Line 2 reads:

PHP:

session_start();


Any thoughts?

I use a little function to check for the session. This has resolved all my problems

Code:

//Start session variable.  Check if user is logged in and set $user variable

function session_started(){
    if(isset($_SESSION)){ return true; }else{ return false; }
}

//Start the output buffer so we dont create any errors with headers
ob_start(); 

//Check to see if it has been started
if(!session_started()){
	session_start();
}

//Flush the buffer to screen
ob_end_flush();

if ($au=$_SESSION['_amember_user']){ // user is logged-in 
blah blah blah
}

where do i have to add that ?
iam getting same error

This doesn't work for me --I still get the same session_start errors. Is there more to it?