small problem about retrieving variable from SESSION‏

Hi, all,
I am new to Squirrel mail and not sure if this is the right place to ask questions. In a research project, I need for some reason to modify the sm code. Specifically, I need to modify the right_main.php, so that each time when I click "inbox" it will not call sqimap_login() again if we already have one imap session remaining. I do not logout from imap explicitly.   Only the first time we need to create a imap connection. My problem is, with the below code(the output followed), I cannot get back the imapConnection when I click inbox or simply refresh the page. 

Any suggestions? Thanks very much.

/* Open a connection on the imap port (143) */global $imapConnection;//var_dump("$username");//var_dump("$imapConnection");sqgetGlobalVar('imap',$imapConnection,SQ_SESSION);echo "Before: "; var_dump("$imapConnection");echo "<br />";//echo "Before: $imapConnection <br />";
if(empty($imapConnection)) {     $imapConnection = sqimap_login($username, $key, $imapServerAddress, $imapPort, 0);     sqsession_register($imapConnection,'imap');     sqgetGlobalVar('imap',$imap,SQ_SESSION);//check if I've put imap connection descriptor  to SESSION successfully.     var_dump("$imap");     }echo "After:"; var_dump("$imapConnection");

 The output is : 
Before: string(1) "0" string(15) "Resource id #65" After:string(15) "Resource id #65"

Regards,Jerry

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