--- a/show.js	Tue Jan 24 13:13:48 2017 +0200
+++ b/show.js	Tue Jan 24 16:43:58 2017 +0200
@@ -49,11 +49,19 @@
 }
 
 
+function setTickUpdate(qtime)
+{
+  if (!timeOutSet)
+  {
+    timeOutSet = true;
+    setTimeout(function() { tickMain(); }, qtime);
+  }
+}
+
+
 //
 // Main tick function, check for updates from server
 //
-var timeOutSet = false;
-
 function tickMain()
 {
   timeOutSet = false;
@@ -64,11 +72,7 @@
     if (txt == "changed")
     {
       viewChanged();
-      if (!timeOutSet)
-      {
-        setTimeout("tickMain();", 250);
-        timeOutSet = true;
-      }
+      setTickUpdate(250);
     }
     else
     if (txt == "reload")
@@ -77,26 +81,19 @@
     }
     else
     {
-      if (!timeOutSet)
-      {
-        setTimeout("tickMain();", 500);
-        timeOutSet = true;
-      }
+      setTickUpdate(500);
     }
   }
   
   var mfail = function(txt)
   {
     displayError();
-    if (!timeOutSet)
-    {
-      setTimeout("tickMain();", 5000);
-      timeOutSet = true;
-    }
+    setTickUpdate(5000);
   }
 
   jsSendPOSTRequest("action=check&lastUpdate="+lastUpdate, msuccess, mfail);
 }
 
-setTimeout("tickMain();", 100);
+var timeOutSet = false;
+setTickUpdate(100);
 viewChanged();