JS cookie redirect problem

Hello,

I am using the script below to only see if a cookie is present, if so, redirecting to the page.  I believe this is setting a cookie as well.  Can someone please help edit this code so it will only check to see if cookie "COOKIENAME" is present, if so redirect to the url?

Thank you

// page to go to if cookie exists
go_to = "index.php?option=com_content&view=article&id=91&Itemid=73";
 
function readCookie(FindWhere){
    var start = document.cookie.indexOf(COOKIENAME);
    if (start == -1){ 
        document.cookie = "User=yes"; expires=" + ged(num_days)";
    } else {
        window.location = go_to;
    }
}
 
readCookie("User");

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