diff --git a/skins/default/functions.js b/skins/default/functions.js
index bc9a486d7..df8af15af 100644
--- a/skins/default/functions.js
+++ b/skins/default/functions.js
@@ -57,7 +57,7 @@ function rcmail_hide_header_form(id)
   link.style.display = '';
   
   parent = link.parentNode;
-  links = parent.getElementsByTagName('A');
+  links = parent.getElementsByTagName('a');
 
   for (var i=0; i<links.length; i++)
     if (links[i].style.display != 'none')
diff --git a/skins/default/splitter.js b/skins/default/splitter.js
index fae3ca5cb..74c751c2b 100644
--- a/skins/default/splitter.js
+++ b/skins/default/splitter.js
@@ -103,7 +103,7 @@ function rcube_splitter(attrib)
     rcube_event.add_listener({element:document, event:'mouseup', object:this, method:'onDragStop'});
 
     // need to listen in any iframe documents too, b/c otherwise the splitter stops moving when we move over an iframe
-    var iframes = document.getElementsByTagName('IFRAME');
+    var iframes = document.getElementsByTagName('iframe');
     this.iframe_events = Object();
     for (var n in iframes)
       {
@@ -182,7 +182,7 @@ function rcube_splitter(attrib)
     rcube_event.remove_listener({element:document, event:'mouseup', object:this, method:'onDragStop'});
     this.drag_active = false;
 
-    var iframes = document.getElementsByTagName('IFRAME');
+    var iframes = document.getElementsByTagName('iframe');
 
     for (var n in iframes)
       {