solucion parcial bug de cerrar session

funciones/conex.php

@@ -22,12 +22,16 @@ function Conectarse(){
       exit();
    }
    */
+   $timestamp =time();
 	$_SESSION['path']= $path_instalacion;
 	$_SESSION['path_images_secure']= $path_images_secure;
 	$_SESSION['url']= $url;
 	$_SESSION['site']= $site;
 	$_SESSION['analizador']= "$codigo_analizador";
 	$_SESSION['upload_size']= $upload_size;
+
+	$_SESSION['timestamp']= $timestamp;
+
    return $link;
    }
 }
@@ -54,13 +58,16 @@ function Conectarse_recursivo(){
       exit();
    }
    */
+      $timestamp =time();
+
 	$_SESSION['path']= $path_instalacion;
 	$_SESSION['path_images_secure']= $path_images_secure;
 	$_SESSION['url']= $url;
 	$_SESSION['site']= $site;
 	$_SESSION['analizador']= "$codigo_analizador";
-	$_SESSION['upload_size']= $upload_size;
+	$_SESSION['timestamp']= $timestamp;
+	setcookie("timestamp",$timestamp);
    return $link;
    }
 }
-?>
+?>

js/scripts.js

@@ -1,3 +1,36 @@
+ function revisarSession(){
+	tiempo = "30";
+	gavela="19";
+	timestamp = Math.round(Date.now() /1000)
+	inicio = leerCookie("timestamp");
+	transcurrido = (timestamp - inicio);
+	transcurrido_minutos = Math.round(transcurrido/60);
+	restante = (tiempo - transcurrido_minutos)
+	prefin = (tiempo*60)-transcurrido
+
+  	document.form_session.tiempo_session.value = "Cerrar en: "+restante+" minutos ";
+  	
+  	if(restante == 1 ){
+	//alert(transcurrido);
+	location.href="./includes/salir.php";
+}else{
+    setTimeout("revisarSession()",2000) ;
+}
+}
+
+
+function leerCookie(nombre) {
+         var lista = document.cookie.split(";");
+         for (i in lista) {
+             var busca = lista[i].search(nombre);
+             if (busca > -1) {micookie=lista[i]}
+             }
+         var igual = micookie.indexOf("=");
+         var valor = micookie.substring(igual+1);
+         return valor;
+         }
+
+
 function loadArticle(pageNumber,id,plantilla,registros,scroll) {
 
 	var newDiv = document.createElement('div');