diff --git a/lib/javascript-static.js b/lib/javascript-static.js
index 13547d42e21..c90e1062232 100644
--- a/lib/javascript-static.js
+++ b/lib/javascript-static.js
@@ -796,6 +796,9 @@ function checkall() {
     var inputs = document.getElementsByTagName('input');
     for (var i = 0; i < inputs.length; i++) {
         if (inputs[i].type == 'checkbox') {
+            if (inputs[i].disabled || inputs[i].readOnly) {
+                continue;
+            }
             inputs[i].checked = true;
         }
     }
@@ -805,6 +808,9 @@ function checknone() {
     var inputs = document.getElementsByTagName('input');
     for (var i = 0; i < inputs.length; i++) {
         if (inputs[i].type == 'checkbox') {
+            if (inputs[i].disabled || inputs[i].readOnly) {
+                continue;
+            }
             inputs[i].checked = false;
         }
     }