window.setTimeout("keepAlive();", 1140000); //1140 sec = 19 min
//window.setTimeout("keepAlive();", 10000); //10 sec for testing

/*
Function opens a popup window that alerts user that his session is about
to timeout. If the user does not respond to the prompt of the popup his
form will automatically be saved and he will be
*/

function keepAlive()
{
	window.setTimeout("keepAlive();", 1140000); //1140 sec = 19 min
	//window.setTimeout("keepAlive();", 10000); //10 sec for testing

	sndReqSessionKeepAlive('/private/session_keepalive.php');

}


function createRequestObject() {
	var ro;
	var browser = navigator.appName;
	if(browser == "Microsoft Internet Explorer"){
		ro = new ActiveXObject("Microsoft.XMLHTTP");
	}else{
		ro = new XMLHttpRequest();
	}
	return ro;
}

var http = createRequestObject();

function sndReqSessionKeepAlive(url)
{
	http.open('get', url);
	http.onreadystatechange = handleResponseSessionKeepAlive;
	http.send(null);
}

function handleResponseSessionKeepAlive() 
{
	if(http.readyState == 4){
		var response = http.responseText;
	}
}