handling sessions through localStorage

Former-commit-id: d0d13f1e1a42e4663ce65b1bbfd90bf0d5d71cfe

kadmos/vistoms/templates/VISTOMS_sessions.html

@@ -31,6 +31,21 @@
 			{
                 alert("OOPS! VISTOMS unfortunately does not work properly on " + bowser.name + ". Please use a different browser to see its awesome visualization features!")
 			}
+
+			if (window && window.localStorage)
+			{
+				var storage = window.localStorage;
+				var existingSessionId = storage.getItem('sessionId');
+				if (existingSessionId)
+				{
+					sessionID = existingSessionId;
+				}
+				else {
+					storage.setItem('sessionId', sessionID);
+				}
+			}
+
+
             
             //aigner: Include function
 			function include(arr,obj) {