diff --git a/UI/WebServerResources/MailerUI.js b/UI/WebServerResources/MailerUI.js
index c4b8b4530..649ad6b25 100644
--- a/UI/WebServerResources/MailerUI.js
+++ b/UI/WebServerResources/MailerUI.js
@@ -494,7 +494,11 @@ function openMailbox(mailbox, reload, idx) {
     var account = Mailer.currentMailbox.split("/")[1];
     if (accounts[account].supportsQuotas) {
       var quotasUrl = ApplicationBaseURL + mailbox + "/quotas";
-      triggerAjaxRequest(quotasUrl, quotasCallback);
+      if (document.quotaAjaxRequest) {
+	document.quotaAjaxRequest.aborted = true;
+	document.quotaAjaxRequest.abort();
+      }
+      document.quotaAjaxRequest = triggerAjaxRequest(quotasUrl, quotasCallback);
     }
   }
 }
@@ -601,6 +605,8 @@ function quotasCallback(http) {
       window.status = text;
     }
   }
+
+  document.quotaAjaxRequest = null;
 }
 
 function onMessageContextMenu(event) {
diff --git a/UI/WebServerResources/generic.js b/UI/WebServerResources/generic.js
index c5ef30a00..0888d79a5 100644
--- a/UI/WebServerResources/generic.js
+++ b/UI/WebServerResources/generic.js
@@ -322,7 +322,7 @@ function onAjaxRequestStateChange(http) {
       http.callbackData = null;
     }
   }
-  catch (e) {
+  catch(e) {
     activeAjaxRequests--;
     checkAjaxRequestsState();
     http.onreadystatechange = Prototype.emptyFunction;