function readCookie(name) {
	     var cookiename = name + "=";
	     var ca = document.cookie.split(';');

	     for(var i=0;i < ca.length;i++) {
	          var c = ca[i];
	          while (c.charAt(0)==' ') c = c.substring(1,c.length);
	          if (c.indexOf(cookiename) == 0) return c.substring(cookiename.length,c.length);
	     }

	     return null;
	}

	var _cookie = readCookie('username');
	var _id = null;