function readCookie()
{
  var cookieValue = "";
  var search = "user_id" + "=";
  if(document.cookie.length > 0)
  { 
    offset = document.cookie.indexOf(search);
    if (offset != -1)
    { 
      offset += search.length;
      end = document.cookie.indexOf(";", offset);
      if (end == -1) end = document.cookie.length;
      cookieValue = unescape(document.cookie.substring(offset, end))
    }
  }
  return cookieValue;
}
if (readCookie() != "")
{
	setTimeout(update_online_status,1000);
	setInterval(update_online_status,120000);
	
} 
var step = 0;
var title = document.title;
var wb;
function flash_title() { 
	step++; 
	if (step==3) {step=1;} 
	if (step==1) {document.title="【新消息】" + title;} 
	if (step==2) {document.title="【　　　】" + title;} 
} 
function update_online_status(){
	if (wb != null)
	{
		window.clearInterval(wb); 
	}
	$.post("/community/update_online_status",function(msg){
		if (msg == '1')
		{	
			wb = setInterval(flash_title,1000); 
		}
	} );	
}