var xmlHttpUser;
var userTimer;
var uid=0;

function keepAlive() 
{    
    if(uid==0) return;
    xmlHttpUser=GetXmlHttpObject();
    var url="http://"+raddr+"/WebServices/wsUsers.ashx";
    url=url+"?mode=0";//keepAlive
    url=url+"&id=" + uid;
    url=url+"&sid="+Math.random();
    xmlHttpUser.onreadystatechange=keepAliveState;
	xmlHttpUser.open("GET",url,true);
	xmlHttpUser.send(null);
}

function keepAliveState()
{   
	//if (xmlHttpUser.readyState==4 && xmlHttpUser.status==200){}
}

function RegisterKeepAliveTimer()
{
    keepAlive();
    userTimer=setTimeout("RegisterKeepAliveTimer()",5000);
}