Generate event id per page view

eventid.js

<script>
            function makeid()
                {
                    var text = "";
                    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
                    for( var i=0; i < 16; i++ )
                    text += possible.charAt(Math.floor(Math.random() * possible.length));
                    return text;
                };    
                var wp_event_ID = makeid();
         </script>