uid = new Date().getTime();
var randomNumber = '';
for(var i = 0 ; i < 5 ; i ++){
 randomNumber += new String (Math.floor(Math.random() * 10));
}
uid = uid + randomNumber;

statistics: function(position){
 var pic = "http://wx.daigj.com/notification/statistics/p.gif";
 var uid = util.readCookie("uid");
 var imgLength = $("#statistics-img").length;
 if(uid){
 if(imgLength == 0){
  $('body').append('<img id="statistics-img" src="' + pic + '?uid='+ uid + '&position='+ position +'"/>');
 }else{
  $("#statistics-img").attr("src",pic+"?uid="+uid+"&position="+position);
 }
 }else{
 uid = new Date().getTime();
 var randomNumber = '';
 for(var i = 0 ; i < 5 ; i ++){
  randomNumber += new String (Math.floor(Math.random() * 10));
 }
 uid = uid + randomNumber;
 util.createCookie("uid",uid);
 $('body').append('<img id="statistics-img" src="' + pic + '?uid='+ uid + '&position='+ position +'"/>');
 }
}