same windows authentication credential for multiple website issue, authentication, jquery, windows

I have created a parent website which contains all child website link, Where we can redirect to child website with the help of parent website, But my problem is I have windows authentications for both parent and child website ,When I open my parent website it will ask me for windows username and password after entering my parent website will open, But when I try to redirect to my child it will again ask for windows authentication pop that I don’t ,I want only one time it will ask me for windows authentication for parent website not for child website can someone help me out with the solution.

What I have tried is

<script type="text/javascript">
    function CallWebApp(strURL) {
        //    type: "GET",
        //    data: {},
        //    url: strURL,
        //    dataType: 'json',
        //    xhrFields: {
        //        withCredentials: true
        //    },
        //    crossDomain: true
            url: strURL,
            dataType: 'json',
            crossDomain: true,
            xhrFields: { withCredentials: true },
            success: function (data) {
                //alert("Success:"+ data);
                var w =;
                var html = data;
            error: function (Er) {
                //alert("Error: "+ Er);
                var a = JSON.stringify(Er);
                var w =;
                var html = a;
                //alert("Err: "+a);


Source: Windows Questions