Retrieving Session Variable client side.

[vb89]

Currently, in my web application I have a listbox that gets populated client side (via java script) with a set of ids -- we'll call this page 1. Server side, I am populating a variable with the ids and passing it through a query string to another page -- we'll call it page 2. Now, I have a previous button on page2 which allows me to go to page 1. I'm trying to figure out how to repopulate the listbox on page 1 with the values previously selected. I was thinking of just storing the set of ids in a session variable and using it client side to repopulate the list box. Can anyone advise on how to access a session variable client side?

Here's some snippets of my code...
- ASP page

// function that calls the function that populates the listbox
function CopyItem(plyrDuplicate) {
    var plyrDuplicate = (typeof plyrDuplicate == "undefined")?'defaultValue':plyrDuplicate;
    var firstListBox = document.getElementById('<%= lstPlayerSelect.ClientID %>');
    var secondListBox = document.getElementById('<%= lstPlayerQueue.ClientID %>'); 
    for (var i = 0; i < firstListBox.options.length; i++) 
        { 
        if (firstListBox.options[i].selected) {
            var newOption = document.createElement("option");
            newOption.text = firstListBox.options[i].text;
            newOption.value = firstListBox.options[i].value;
            playerVal = newOption.value;
            CheckDuplicate(playerVal);
            var printRec =  CheckDuplicate(playerVal);
           // alert(playerVal);
           //alert(CheckDuplicate(playerVal));
            if (printRec != true) {
            secondListBox.options[secondListBox.options.length] = newOption;
            }
        }         
    }
    if (document.getElementById('ErrorMsg').style.display = 'inherit') {
        document.getElementById('ErrorMsg').style.display = 'none';
    }
    Updatelist();
    return false;
}

//Function that actually populates the listbox
function Updatelist() 
{
    var objPlyrQue = document.getElementById('<%= lstPlayerQueue.ClientID %>');
    var objHidden  = document.getElementById('<%= hdnPlyrLst.ClientID %>');
    objHidden.value = "";
    
    var listLength = objPlyrQue.options.length;
    for (var i = 0; i < listLength; i++) 
    {
      objHidden.value = objHidden.value + objPlyrQue.options[i].value;
      if (i != listLength-1) 
      {
       objHidden.value = objHidden.value + ', ';
      }
     //alert(objHidden.value);
    }
}

-- code behind for "Page 1"

'Builds and passes Query String 
    Protected Sub btnNext_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnNext.Click

        Dim iFileType As String
        Dim iSeason As Integer
        Dim TeamStats As String
        Dim PlayerID As String
        Dim FileTypeTxt As String
        Dim iSeasonID As Integer

        PlayerID = hdnPlyrLst.Value
        iSeason = Request.QueryString("pSeason")
        iSeasonID = Request.QueryString("pSeasonID")
        TeamStats = Request.QueryString("pTeamStats")
        iFileType = Request.QueryString("pFileType")
        FileTypeTxt = Request.QueryString("pFileTypeTxt")

        Response.Redirect("send_file.aspx?pPlayerID=" & PlayerID & "&pSeasonID=" & iSeasonID & "&pSeason=" & iSeason & "&pTeamStats=" & TeamStats & "&pFileType=" & iFileType & "&pFileTypeTxt=" & FileTypeTxt)

    End Sub

-- code behind for "page2"

'Code behind for previous buton
    Protected Sub btnPrevious_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPrevious.Click
        'Declare Variable
        Dim pPlayerId As String
        Dim PlayerID As String

        'Initialize Variables
        PlayerID = Request.QueryString("pPlayerID")
        pPlayerId = String.Concat("", PlayerID, "")

        'If pPlayerId <> "" Then
        Session("playerId") = pPlayerId
        Response.Redirect(prevPage)
        'Else
        'Response.Redirect("prevPage?pPlayerID=" & pPlayerId)
        'End If
    End Sub