QueryString id is undefined in JavaScript

In my application when user clicks on an audio audio id is retrived in page load and this audio id should be passed to multiple tabs in the browser because i had added an chrome extension which controls the audio in the previous tab from multiple new tabs on button click but i need to control it on keydown event from multiple new tabs if i pass the audio id to all the tabs can i control it using keydown event or how can i control the audio in main tab from multiple new tab using keydown protected void Page_Load(object sender, EventArgs e) { if (Session["uid"] == null) { Response.Redirect("Login.aspx"); } adm = new Admin(); ID = Request.QueryString["ID"]; } Here i am getting audio id on page load and this id should be retrived and passed to the newly opened tabs in browser,by passing in this way can i control the audio from multiple tabs using keydown aspx code- <asp:TemplateField HeaderText="Play Audio File" ItemStyle-Width="200px" ItemStyle-HorizontalAlign="Center" > <ItemTemplate> <audio controls="controls" id="player"> <source src='<%# Eval("audio") %>' /> your browser does not support the audio element.</audio> </ItemTemplate> </asp:TemplateField>