var vImgCode = Math.random().toString(10).substring(2,6);
    var ele = document.getElementById("confirmPicture");
    if(null != ele){
        document.getElementById("confirmPicture").src="/userLogin.aspx?c=" + vImgCode;   
        document.getElementById("iptConfirm").value = vImgCode;
    }

    if(top.location == document.location)
    {
        document.getElementById("isTop").value = 1;
    }
    else{
        document.getElementById("isTop").value = 0;
    }