gistfile1.js

    <script type="text/javascript">
        function getFullUrl(url) {
            var urlparts = url.split(/&amp;|\?/g);
            var urlpath = urlparts[0];
            if (urlpath.indexOf('://') &lt; 0) {
                if (urlpath[0]== '/') {
                    return urlpath;
                }
                else {
                    var startpathloc = window.location.pathname.lastIndexOf('/');
                    return window.location.pathname.substring(0, startpathloc+1) + urlpath;
                }
            }

            return url;
        }

        function addWindowCookie(url) {
            var windowId = window.name;
            if (windowId == undefined) {
                return;
            }

            // 2 seconds expiry time
            var expdt = new Date();
            expdt.setTime(expdt.getTime()+(1*1000));
            var expires = "; expires="+expdt.toGMTString();
            var fullurl = getFullUrl(url);
            var pathName = encodeURIComponent(fullurl.replace(/\//g, ""));
            document.cookie = pathName + '-codiWindowId=' + windowId + expires;
        }

        window.onload = function() {
            var anchors = document.getElementsByTagName("a");
            var i=0;
            for (i=0;i&lt;anchors.length;i++) {
                var a = anchors[i];
                if (a.getAttribute('onclick') == undefined) {
                    var url = a.getAttribute('href');
                    a.setAttribute('onclick', "addWindowCookie('" + url + "'); return true;")
                }
            }
        }
    </script>