Set Cookie for first time visitor

set-visitor-cookie.js

         function setCookie(c_name, value, exdays) {
            var exdate = new Date();
            exdate.setDate(exdate.getDate() + exdays);
            var c_value = escape(value) + ((exdays == null) ? "" : "; expires=" + exdate.toUTCString());
            document.cookie = c_name + "=" + c_value;
         }

         function getCookie(c_name) {
            var c_value = document.cookie;
            var c_start = c_value.indexOf(" " + c_name + "=");
            if (c_start == -1) {
               c_start = c_value.indexOf(c_name + "=");
            }
            if (c_start == -1) {
               c_value = null;
            } else {
               c_start = c_value.indexOf("=", c_start) + 1;
               var c_end = c_value.indexOf(";", c_start);
               if (c_end == -1) {
                  c_end = c_value.length;
               }
               c_value = unescape(c_value.substring(c_start, c_end));
            }
            return c_value;
         }

         function delCookie(name) {
            document.cookie = name + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;';
         }


         //Checks if the cookie already exists
         if (!getCookie('firsttime')) {
            // Visitor came first time on website
            setCookie('firsttime', true);
         } else {
            // Visitor was already here
         }