Jquery script to logout from all opened tab if user click on logout on any page

Jquery script to logout from all opened tab if user click on logout on any page

Hi,

I want script to log out from all opened tab if user click on log out on any opened tab using jquery and  php.

For this I am using following script but it's taking heavy resource of server as my site is on shared server:
is_session_expired.php code:
<?php
    session_start();
    //echo $_SESSION['sess_memberid'];   
    if(isset($_SESSION['sess_memberid'])){
        echo "no";
    }else{
        "yes";
    }
?>


<script>
function isSessionExpired(url,dopage){
    //alert(url);   
    var randval = Math.random();
    var datastring = "action=31&rand="+randval;   
    var url1 = url+"includes/is_session_expired.php";   
    //alert(url);
    $.ajax({       
        type: 'POST',           
        url: url1,
        cache: false,
        data: datastring,       
        dataType: "html",
        success: function(message) {
            var msg = $.trim(message);
            //alert(dopage);
            //alert(msg)
            if(msg=="yes" || msg==""){
                if(dopage!="login" && dopage!="" && dopage!="plan_expired"){
                    alert("Your session has been expired, Please reload the page and log back in.");
                    redirectPage(url);
                }
            }
           
        }
    });
}


    setInterval(function(){isSessionExpired('<?=$siteroot;?>','<?=$_REQUEST['do'];?>')},2000);
   
</script>

Thanks,
Madan