diff --git a/korektury/static/korektury/opraf.js b/korektury/static/korektury/opraf.js
index 5d042ec1..760f3c6a 100644
--- a/korektury/static/korektury/opraf.js
+++ b/korektury/static/korektury/opraf.js
@@ -65,6 +65,12 @@ function place_comments_one_div(img_id, comments)
 	}
 }
 
+function place_comments() {
+    for (var i=0; i < comments.length-1; i++) {
+	    place_comments_one_div(comments[i][0], comments[i][1])
+    }
+}
+
 // ctrl-enter submits form
 function textarea_onkey(ev)
 {
@@ -238,6 +244,33 @@ function save_scroll(form)
 	return true;
 }
 
+function toggle_corrections(aclass)
+{
+	var stylesheets = document.styleSheets;
+	var ssheet = null;
+	for (var i=0;i<stylesheets.length; i++){
+		if (stylesheets[i].title === "opraf-css"){
+			ssheet = stylesheets[i];
+			break;
+		}
+	}
+	if (! ssheet){
+		return;	
+	}
+	for (var i=0;i<ssheet.cssRules.length;i++){
+		var rule = ssheet.cssRules[i];	
+		if (rule.selectorText === '.'+aclass){
+			if (rule.style.display === ""){
+				rule.style.display = "none";
+			} else {
+				rule.style.display = "";
+			}
+		}
+	}
+	place_comments();
+		
+}
+
 
 String.prototype.unescapeHTML = function () {                                       
         return(                                                                 
diff --git a/korektury/templates/korektury/opraf.html b/korektury/templates/korektury/opraf.html
index 6a7d97c3..94e06560 100644
--- a/korektury/templates/korektury/opraf.html
+++ b/korektury/templates/korektury/opraf.html
@@ -3,7 +3,7 @@
 <html>
 <head>
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
-  <link rel="stylesheet" type="text/css" media="screen, projection" href="{% static "korektury/opraf.css"%}" />
+  <link rel="stylesheet" title="opraf-css" type="text/css" media="screen, projection" href="{% static "korektury/opraf.css"%}" />
   <script src="{% static "korektury/opraf.js"%}"></script>
 	<title>Korektury {{pdf.nazev}}</title>
 </head>
@@ -22,13 +22,25 @@
 	<a href="https://mam.mff.cuni.cz/wiki">wiki</a> |
 	<hr />
 	Zobrazit: 
-	<input type="checkbox" id="k_oprave_checkbox" name="k_oprave_checkbox" checked>
-	<label for="k_oprave_checkbox">K opravě</labe>
-	<input type="checkbox" id="opraveno_checkbox" name="opraveno_checkbox" checked>
-	<label for="opraveno_checkbox">Opraveno</labe>
-	<input type="checkbox" id="neni_chyba_checkbox" name="neni_chyba_checkbox" checked>
+	<input type="checkbox" 
+		id="k_oprave_checkbox" 
+		name="k_oprave_checkbox" 
+		onchange="toggle_corrections('k_oprave')" checked>
+	<label for="k_oprave_checkbox">K opravě</label>
+	<input type="checkbox"
+		id="opraveno_checkbox"
+		name="opraveno_checkbox" 
+		onchange="toggle_corrections('opraveno')" checked>
+	<label for="opraveno_checkbox">Opraveno</label>
+	<input type="checkbox"
+		id="neni_chyba_checkbox"
+		name="neni_chyba_checkbox"
+		onchange="toggle_corrections('neni_chyba')" checked>
 	<label for="neni_chyba_checkbox">Není chyba</labe>
-	<input type="checkbox" id="k_zaneseni_checkbox" name="k_zaneseni_checkbox" checked>
+	<input type="checkbox"
+		id="k_zaneseni_checkbox"
+		name="k_zaneseni_checkbox"
+		onchange="toggle_corrections('k_zaneseni')" checked>
 	<label for="k_zaneseni_checkbox">K opravě</labe>
 
 	<hr/>
