diff --git a/.classpath b/.classpath
index 3e75f39..929323c 100644
--- a/.classpath
+++ b/.classpath
@@ -24,6 +24,7 @@
 	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
 		</attributes>
 	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7">
diff --git a/pom.xml b/pom.xml
index 189fdda..0339c1d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -11,7 +11,7 @@
 
 	<groupId>org.gcube.portlets.widgets</groupId>
 	<artifactId>session-checker</artifactId>
-	<packaging>jar</packaging>
+	<packaging>war</packaging>
 	<version>0.1.0-SNAPSHOT</version>
 	<name>gCube Session Checker Widget</name>
 	<description>
diff --git a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/CheckSession.java b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/CheckSession.java
index 9e9068e..625eb77 100644
--- a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/CheckSession.java
+++ b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/CheckSession.java
@@ -1,14 +1,28 @@
 package org.gcube.portlets.widgets.sessionchecker.client;
 
+import org.gcube.portlets.user.gcubewidgets.client.popup.GCubeDialog;
+import org.gcube.portlets.widgets.sessionchecker.client.bundle.CheckSessionBundle;
+import org.gcube.portlets.widgets.sessionchecker.client.elements.Div;
 import org.gcube.portlets.widgets.sessionchecker.shared.SessionInfoBean;
 
 import com.google.gwt.core.client.GWT;
+import com.google.gwt.dom.client.Style.Display;
 import com.google.gwt.user.client.Timer;
-import com.google.gwt.user.client.Window;
 import com.google.gwt.user.client.rpc.AsyncCallback;
+import com.google.gwt.user.client.ui.HTML;
+import com.google.gwt.user.client.ui.HasAlignment;
+import com.google.gwt.user.client.ui.RootPanel;
+import com.google.gwt.user.client.ui.VerticalPanel;
 
 public class CheckSession {
-	private final int MILLI_SECONDS = 60 * 1000; //60 seconds
+	private final int MILLI_SECONDS = 45 * 1000; //45 seconds
+	
+	//for css and images
+	private CheckSessionBundle images = GWT.create(CheckSessionBundle.class);
+	
+	static {
+		CheckSessionBundle.INSTANCE.css().ensureInjected();
+	}
 	/**
 	 * Create a remote service proxy to talk to the server-side Greeting service.
 	 */
@@ -18,15 +32,23 @@ public class CheckSession {
 	private String scope;
 	private Timer t;
 	
-	private static CheckSession singleton;
+	//needed to mask the page when session id up!
+	private Div maskDiv = new Div();
 	
+	private static CheckSession singleton;
+
 	public static CheckSession getInstance() {
 		if (singleton == null)
 			singleton = new CheckSession();
 		return singleton;
 	}
-	
-	private CheckSession() {		
+
+	private CheckSession() {	
+		
+		addMaskDiv2DOM();
+		maskDiv.setStyleName("div-mask");
+		
+		//polling timer
 		t = new Timer() {			
 			@Override
 			public void run() {
@@ -34,15 +56,22 @@ public class CheckSession {
 					@Override
 					public void onSuccess(SessionInfoBean result) {
 						if (result != null) {
+							
 							username = result.getUsername();
 							scope = result.getScope();
 							boolean userValid = ( username != null) ? true : false;
 							boolean scopeValid = (scope != null) ? true : false;
-							
+
 							if (! (userValid && scopeValid) ) {
-								Window.alert("Session Expired");
+								mask(true);
+								stopPolling();
+								showLogoutDialog();
 							}
-						}				
+						}	
+						else {
+							GWT.log("result null");
+							stopPolling();
+						}
 					}					
 					@Override
 					public void onFailure(Throwable caught) { }
@@ -50,7 +79,43 @@ public class CheckSession {
 			}
 		};	
 	}
+
+	private void addMaskDiv2DOM() {	
+		RootPanel.get().insert(maskDiv, 0);
+	}
+	/**
+	 * set visible the masking div setting/unsetting css display property
+	 * @param mask
+	 */
+	private void mask(boolean mask) {
+		GWT.log("Masking");
+		if (mask) 
+			maskDiv.getElement().getStyle().setDisplay(Display.BLOCK);
+		else
+			maskDiv.getElement().getStyle().setDisplay(Display.NONE);			
+	}
 	
+	private void showLogoutDialog() {
+		GCubeDialog dlg = new GCubeDialog();
+		dlg.setText("Your Session Expired!");
+		
+		VerticalPanel topPanel = new VerticalPanel();
+		topPanel.setPixelSize(420, 290);
+		
+		topPanel.setHorizontalAlignment(HasAlignment.ALIGN_CENTER);
+		
+		HTML toShow = new HTML("<div style=\"margin-top: 40px;\">"
+				+ "<img style=\"margin: 0; vertical-align: middle; \" src='" + images.expired().getSafeUri().asString() + "'>"
+				+ "</div><div style=\"font-size: 18px; height: 20px; padding-top: 20px;\">"
+				+ "Please <a href=\"javascript: location.reload();\">reload<a/> this page.</div>");
+
+		
+		topPanel.add(toShow);
+		dlg.add(topPanel);
+		dlg.center();
+		dlg.show();
+	}
+
 
 	public String getUsername() {
 		return username;
diff --git a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/SessionChecker.java b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/SessionChecker.java
index 9394d3a..b818bbf 100644
--- a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/SessionChecker.java
+++ b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/SessionChecker.java
@@ -8,5 +8,6 @@ import com.google.gwt.core.client.EntryPoint;
 public class SessionChecker implements EntryPoint {
  
   public void onModuleLoad() {
+	 CheckSession.getInstance().startPolling();
   }
 }
diff --git a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/CheckSession.css b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/CheckSession.css
new file mode 100644
index 0000000..998217f
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/CheckSession.css
@@ -0,0 +1,11 @@
+@external div-mask;
+
+.div-mask {
+	position: fixed;
+	width: 100%;
+	height: 100%;
+	background-color: rgba(0,0,0,.15);
+	top: 0;
+	left: 0;
+	display: none;
+}
\ No newline at end of file
diff --git a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/CheckSessionBundle.java b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/CheckSessionBundle.java
new file mode 100644
index 0000000..86603b8
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/CheckSessionBundle.java
@@ -0,0 +1,17 @@
+package org.gcube.portlets.widgets.sessionchecker.client.bundle;
+
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.resources.client.ClientBundle;
+import com.google.gwt.resources.client.CssResource;
+import com.google.gwt.resources.client.ImageResource;
+
+public interface CheckSessionBundle extends ClientBundle {
+
+	public static final CheckSessionBundle INSTANCE = GWT.create(CheckSessionBundle.class);
+
+	@Source("CheckSession.css")
+	public CssResource css();
+
+	@Source("session_expired.jpg")
+	ImageResource expired();
+}
diff --git a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/session_expired.jpg b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/session_expired.jpg
new file mode 100644
index 0000000..5b66306
Binary files /dev/null and b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/bundle/session_expired.jpg differ
diff --git a/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/elements/Div.java b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/elements/Div.java
new file mode 100644
index 0000000..04eab23
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/widgets/sessionchecker/client/elements/Div.java
@@ -0,0 +1,27 @@
+package org.gcube.portlets.widgets.sessionchecker.client.elements;
+
+import com.google.gwt.user.client.DOM;
+import com.google.gwt.user.client.ui.HTML;
+import com.google.gwt.user.client.ui.HasText;
+
+/**
+ * 
+ * @author Massimiliano Assante, ISTI-CNR
+ * @version 0.1 Sep 2012
+ *
+ */
+public class Div extends HTML implements HasText {
+
+    public Div() {
+        super(DOM.createElement("div"));
+    }
+
+    public Div(String text) {
+        this();
+        setText(text);
+    }
+    
+    public void setAttribute(String name, String value) {
+    	super.getElement().setAttribute(name, value);
+    }
+}
diff --git a/src/main/java/org/gcube/portlets/widgets/sessionchecker/server/SessionCheckerServiceImpl.java b/src/main/java/org/gcube/portlets/widgets/sessionchecker/server/SessionCheckerServiceImpl.java
index 12e555b..37a787e 100644
--- a/src/main/java/org/gcube/portlets/widgets/sessionchecker/server/SessionCheckerServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/widgets/sessionchecker/server/SessionCheckerServiceImpl.java
@@ -24,11 +24,8 @@ public class SessionCheckerServiceImpl extends RemoteServiceServlet implements
 	 * @return .
 	 */
 	private ASLSession getASLSession() {	
-		System.out.println("\n\n\n*****+ ASL checksession");
 		String sessionID = this.getThreadLocalRequest().getSession().getId();
 		String user = (String) this.getThreadLocalRequest().getSession().getAttribute(ScopeHelper.USERNAME_ATTRIBUTE);
-		
-		System.out.println("ASL checksession ID = " +sessionID);
 		return SessionManager.getInstance().getASLSession(sessionID, user);
 	}