var loadtime = new Date().getTime()/1000;
var loadts = new Date();
var interval = 15000;
var counter = 0;
if (typeof(sgc) == 'undefined') {var sgc = '';}
document.writeln("<img id='langtaojin_sem_stay' width=1px height=1px style='display:none' src='' />");
function staylog(){
	stay = parseInt(new Date().getTime()/1000 - loadtime);
	document.getElementById('langtaojin_sem_stay').src = "http://track.langtaojin.com/tracking/recvdata.js?client_id="+langtaojin_client_id+"&sgc=" + sgc +"&stay="+stay+"&rand="+Math.random();
	counter += 1;
	if (counter >= 4){
		interval *= 2;
		counter = 0;
	}
	setTimeout(function(){staylog();},interval);
}
setTimeout(function(){staylog();},interval);