Handle Cancel JQuery [Are you sure you want to navigate current page]

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jQuery

jQuery-UI

Hi,

I am working on the jquery. If user wants to navigate to any othere page then the confirm box will be displayed with the message "Are you sure you want to navigate current page". For this i wrote below code

window.onbeforeunload = askconfirm;
        window.doAskConfirm = true;

function askconfirm() {
            if (doAskConfirm) {
                if (confirm("Do you want to leave this page?") == true) {
                    //they pressed OK
                } else {
                    // they pressed Cancel
                    window.onbeforeunload = null;
                    window.doAskConfirm = false;
                }
            }
        }

$(document).ready(function () {
            $("button").click(function () {
                window.doAskConfirm = true;
                if (this.id == "home")
                    document.location = '@Url.Action("Index", "Home")';
                else if (this.id == "grp")
                    document.location = '@Url.Action("ViewGroup", "GroupMaintenance")';
                else if (this.id == "client")
                    document.location = '@Url.Action("ClientMaintenanceHome", "ClientMaintenance")';
                else if (this.id == "logout")
                    document.location = '@Url.Action("LogOut", "Login")';
                else {
                    window.doAskConfirm = false;
                    return false;
                }
            });
          });

My Question is how to handle cancel button because when i click on the cancel button script error is giving.

Can any body tell me how to handle cancel the confirm box.

Thanks
Kishore