how to create back button with different parent location using javascript or Jquery

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Hi,

i created back button where page1 and page2 redirects to page3.
When back button is clicked on page3, it redirects back to page1 or page2 accordingly. I used document.referrer which sometimes returns page itself instead of parent location.
That is when click back button on page3 it redirects to page3

function GoBackWithRefresh(event) 
{
    if ('referrer' in document) 
    {
        var ref = document.referrer;
        console.log("document referrer_____<BR>"+ref);
        window.location = document.referrer;
        /* OR */
        //location.replace(document.referrer);
    } 
    else 
    { 
        console.log("window history____"+window.history);
        window.history.back(); 
    }
}
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