firsttouchcookie.js

<script>

    function set_fta(){ 
        var t = Math.round((new Date()).getTime() / 1e3);
        var p = '';
        var b = document.body;
        if (this.fta_h_c(b,'single-post')) {  
            p = 'b--'  
        }
        var n = location.pathname;
        var r = document.referrer;
        var s = location.search;
        var c = this.fta_g_c('_fta');
        if (c === undefined) {
            // set first touch 
                var c =[];
                c[0] = t; // timestamp
                c[1] = p + n; // path
                c[2] = r; // referrer
                c[3] = s; //query
                this.fta_s_c('_fta', c.join('|'), 365);
        }
    }

    function fta_h_c(e, c) {
            return (' ' + e.className + ' ').indexOf(' ' + c+ ' ') > -1; 
    }

    function fta_s_c(cname, cvalue, exdays) {
        var d = new Date();
        d.setTime(d.getTime() + (exdays*24*60*60*1000));
        var expires = "expires="+ d.toUTCString();
        document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
    }

    function fta_g_c(cname) {
        var name = cname + "=";
        var decodedCookie = decodeURIComponent(document.cookie);
        var ca = decodedCookie.split(';');
        for(var i = 0; i <ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') {
            c = c.substring(1);
            }
            if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
            }
        }
        return undefined;
    }

    set_fta();

  </script>