diff --git a/lib/javascript-static.js b/lib/javascript-static.js
index 808165303d8..579b640d287 100644
--- a/lib/javascript-static.js
+++ b/lib/javascript-static.js
@@ -69,3 +69,30 @@ function submitFormById(id) {
         return theform.submit();
     }
 }
+
+function select_all_in(elTagName, elId, elClass) {
+    var inputs = document.getElementsByTagName('INPUT');
+    inputs = filterByParent(inputs, function(el) {return findParentNode(el, elTagName, elId, elClass);});
+    for(var i = 0; i < inputs.length; ++i) {
+        if(inputs[i].type == 'checkbox') {
+            inputs[i].checked = 'checked';
+        }
+    }
+}
+
+function deselect_all_in(elTagName, elId, elClass) {
+    var inputs = document.getElementsByTagName('INPUT');
+    inputs = filterByParent(inputs, function(el) {return findParentNode(el, elTagName, elId, elClass);});
+    for(var i = 0; i < inputs.length; ++i) {
+        if(inputs[i].type == 'checkbox') {
+            inputs[i].checked = '';
+        }
+    }
+}
+
+function confirm_if(expr, message) {
+    if(!expr) {
+        return true;
+    }
+    return confirm(message);
+}