diff --git a/scripts/explorer.js b/scripts/explorer.js
index 4634e30..cfb5d5a 100644
--- a/scripts/explorer.js
+++ b/scripts/explorer.js
@@ -32,6 +32,7 @@ jQuery(document).ready(function($)
     paramTag = (urlParams.get('tags') == null ? urlParams.getAll('tag') : urlParams.getAll('tags'));
     paramPhoto = (urlParams.get('photos') == null ? urlParams.getAll('photo') : urlParams.getAll('photos'));
     paramHelp = (urlParams.get('helps') == null ? urlParams.getAll('help') : urlParams.getAll('helps'));
+    params = { "year": paramYear, "month": paramMonth, "dimension": paramDimension, "genre": paramGenre, "theme": paramTheme, "place": paramPlace, "tag": paramTag, "photo": paramPhoto, "help": paramHelp }
 
     $.getJSON("data.json", function(data)
     {
@@ -183,14 +184,14 @@ jQuery(document).ready(function($)
         {
             selectedYears = [];
             selectedDimensions = [];
-            selectedPhotos = paramPhoto;
-            selectedMonths = paramMonth;
-            selectedGenres = paramGenre;
-            selectedThemes = paramTheme;
-            selectedPlaces = paramPlace;
-            selectedTags = paramTag;
-            selectedHelps = paramHelp;
-            for (p of paramYear)
+            selectedPhotos = params.photo;
+            selectedMonths = params.month;
+            selectedGenres = params.genre;
+            selectedThemes = params.theme;
+            selectedPlaces = params.place;
+            selectedTags = params.tag;
+            selectedHelps = params.help;
+            for (p of params.year)
             {
                 if (p == "50s") for (i = 1956; i <= 1959; i++) selectedYears.push(i);
                 if (p == "60s") for (i = 1960; i <= 1969; i++) selectedYears.push(i);
@@ -200,7 +201,7 @@ jQuery(document).ready(function($)
                 if (p == "00s") for (i = 2000; i <= 2009; i++) selectedYears.push(i);
                 if (p == "10s") for (i = 2010; i <= 2016; i++) selectedYears.push(i);
             }
-            for (p of paramDimension)
+            for (p of params.dimension)
             {
                 if (p == "18") for (i = 18; i <= 19; i++) selectedDimensions.push(i);
                 if (p == "20") for (i = 20; i <= 29; i++) selectedDimensions.push(i);
@@ -279,29 +280,45 @@ jQuery(document).ready(function($)
             }
             handleTags();
 
-            function visualFilterCheckboxItem(name, param)
+            function visualFilterCheckboxItem(name)
             {
+                $('input[name="' + name + 's"]').change(function()
+                {
+                    // set back array with original available
+                    if (this.checked)
+                        params[name] = originalAvailableOptions[name + "s"];
+                    else
+                        params[name] = []
+
+                    selectedOptions = gatherURLdata();
+                    data = originalData;
+                    filterData(selectedOptions);
+                    availableOptions = [];
+                    availableOptions = gatherData();
+                    updateMenu(availableOptions);
+                });
+
                 $('input[name="' + name + '"]').change(function()
                 {
                     if (this.checked)
                     {
                         if (this.id == "exist") // photos special case
                         {
-                            param.push("bad");
-                            param.push("ok");
-                            param.push("good");
+                            params[name].push("bad");
+                            params[name].push("ok");
+                            params[name].push("good");
                         }
-                        param.push(this.id);
+                        params[name].push(this.id);
                     }
                     else
                     {
                         if (this.id == "exist") // photos special case
                         {
-                            removeFromArray(param, "bad");
-                            removeFromArray(param, "ok");
-                            removeFromArray(param, "good");
+                            removeFromArray(params[name], "bad");
+                            removeFromArray(params[name], "ok");
+                            removeFromArray(params[name], "good");
                         }
-                        removeFromArray(param, this.id);
+                        removeFromArray(params[name], this.id);
                     }
                     
                     selectedOptions = gatherURLdata();
@@ -331,14 +348,13 @@ jQuery(document).ready(function($)
                 });
             }
 
-            visualFilterCheckboxItem("photo", paramPhoto);
-            visualFilterCheckboxItem("year", paramYear);
-            visualFilterCheckboxItem("month", paramMonth);
-            visualFilterCheckboxItem("genre", paramGenre);
-            visualFilterCheckboxItem("theme", paramTheme);
-            visualFilterCheckboxItem("dimension", paramDimension);
-            visualFilterCheckboxItem("help", paramHelp);
-
+            visualFilterCheckboxItem("photo");
+            visualFilterCheckboxItem("year");
+            visualFilterCheckboxItem("month");
+            visualFilterCheckboxItem("genre");
+            visualFilterCheckboxItem("theme");
+            visualFilterCheckboxItem("dimension");
+            visualFilterCheckboxItem("help");
             visualFilterListItem("place", paramPlace);
         });