variables in javascript or as $_SESSION?

[moho]

Hi I'm trying to use $_SESSION in my AJAX application.
However this gives me strange data, the $_SESSION variable seems to
change during page load. in the end of the page it's the earlier value that shows.

I set the $_SESSION[id] with this

function setId(id)
{
    try{
    var obj;
    obj  = document.getElementById("sid");
    var serverPage = "setid.php" + "?id="+id;
    xmlhttp.open("GET",serverPage);
    xmlhttp.onreadystatechange = function(){
        if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
            obj.value = xmlhttp.responseText;
        }
    }
        xmlhttp.send(null);
    }catch(eeex)
    {
        alert(eeex);
    }
}
 

So if I don't use $_SESSION the user will loose the id when reloading. I'm just wondering if I'm totally wrong with trying to use $_SESSION

this code below prints out value x the first time, and when $ss it's the old value
meaning $ss != $_SESSION[''id], and the reason I'm using $ss is because otherwise it's empty.

    <input id="tId" name="Id" type="hidden" value="<?php $ss = $_SESSION['id'];echo $_SESSION['id'];?>" />
 
      <input type="submit" name="Submit" value="Save" onclick="submitform(document.getElementById('newproj'),
'process_cons_projects.php','cons_proj_message',validatetask);
updateprojectlist('<?php echo $ss; ?>');return false;"/>
    </label></td>
 

[acoder]

The session value is set server-side (PHP).