diff --git a/jquery.timeago.js b/jquery.timeago.js
index de9dd94..37ef99e 100644
--- a/jquery.timeago.js
+++ b/jquery.timeago.js
@@ -63,17 +63,17 @@
       var days = hours / 24;
       var years = days / 365;
 
-      var words = seconds < 45 && sprintf($l.seconds, Math.round(seconds)) ||
+      var words = seconds < 45 && substitute($l.seconds, Math.round(seconds)) ||
         seconds < 90 && $l.minute ||
-        minutes < 45 && sprintf($l.minutes, Math.round(minutes)) ||
+        minutes < 45 && substitute($l.minutes, Math.round(minutes)) ||
         minutes < 90 && $l.hour ||
-        hours < 24 && sprintf($l.hours, Math.round(hours)) ||
+        hours < 24 && substitute($l.hours, Math.round(hours)) ||
         hours < 48 && $l.day ||
-        days < 30 && sprintf($l.days, Math.floor(days)) ||
+        days < 30 && substitute($l.days, Math.floor(days)) ||
         days < 60 && $l.month ||
-        days < 365 && sprintf($l.months, Math.floor(days / 30)) ||
+        days < 365 && substitute($l.months, Math.floor(days / 30)) ||
         years < 2 && $l.year ||
-        sprintf($l.years, Math.floor(years));
+        substitute($l.years, Math.floor(years));
 
       return $.trim([prefix, words, suffix].join(" "));
     },
@@ -113,8 +113,8 @@
     return (new Date().getTime() - date.getTime());
   }
 
-  // lame sprintf implementation
-  function sprintf(string, value) {
+  function substitute(stringOrFunction, value) {
+    var string = $.isFunction(stringOrFunction) ? stringOrFunction(value) : stringOrFunction;
     return string.replace(/%d/i, value);
   }
 
diff --git a/test.html b/test.html
index aef534e..ea839eb 100644
--- a/test.html
+++ b/test.html
@@ -9,21 +9,9 @@
   <script src="test.js" type="text/javascript"></script>
   <script type="text/javascript">
     jQuery.timeago.settings.allowFuture = true;
-    // jQuery.timeago.settings.strings = {
-    //    ago: "geleden",
-    //    fromNow: "vanaf nu",
-    //    seconds: "iets minder dan een minute",
-    //    minute: "ongeveer een minuut",
-    //    minutes: "%d minuten",
-    //    hour: "ongeveer een uur",
-    //    hours: "ongeveer %d uren",
-    //    day: "een dag",
-    //    days: "%d dagen",
-    //    month: "ongeveer een maand",
-    //    months: "%d maanden",
-    //    year: "ongeveer een jaar",
-    //    years: "%d jaar"
-    // };
+    //loadPigLatin();
+    //loadRussian();
+    //loadYoungOldYears();
 
     jQuery(document).ready(function($) {
       // functional tests
diff --git a/test.js b/test.js
index 508b7ae..ca93c6e 100644
--- a/test.js
+++ b/test.js
@@ -14,3 +14,63 @@ jQuery(document).ready(function($) {
   $('abbr[class*=loaded]').attr("title", iso8601(new Date()));
   $('abbr[class*=modified]').attr("title", iso8601(new Date(document.lastModified)));
 });
+
+function loadPigLatin() {
+  jQuery.timeago.settings.strings = {
+    suffixAgo: "ago-hay",
+    suffixFromNow: "omNow-fray",
+    seconds: "ess-lay an-thay a-hay inute-may",
+    minute: "about-hay a-hay inute-may",
+    minutes: "%d inutes-may",
+    hour: "about-hay an-hay hour-hay",
+    hours: "about-hay %d hours-hay",
+    day: "a-hay ay-day",
+    days: "%d ays-day",
+    month: "about-hay a-hay onth-may",
+    months: "%d onths-may",
+    year: "about-hay a-hay ear-yay",
+    years: "%d years-yay"
+  };
+}
+
+function loadRussian() {
+  (function() {
+    function numpf(n, f, s, t) {
+      // f - 1, 21, 31, ...
+      // s - 2-4, 22-24, 32-34 ...
+      // t - 5-20, 25-30, ...
+      var n10 = n % 10;
+      if ( (n10 == 1) && ( (n == 1) || (n > 20) ) ) {
+        return f;
+      } else if ( (n10 > 1) && (n10 < 5) && ( (n > 20) || (n < 10) ) ) {
+        return s;
+      } else {
+        return t;
+      }
+    }
+
+    jQuery.timeago.settings.strings = {
+      prefixAgo: null,
+      prefixFromNow: "через",
+      suffixAgo: "назад",
+      suffixFromNow: null,
+      seconds: "меньше минуты",
+      minute: "минуту",
+      minutes: function(value) { return numpf(value, "%d минута", "%d минуты", "%d минут"); },
+      hour: "час",
+      hours: function(value) { return numpf(value, "%d час", "%d часа", "%d часов"); },
+      day: "день",
+      days: function(value) { return numpf(value, "%d день", "%d дня", "%d дней"); },
+      month: "месяц",
+      months: function(value) { return numpf(value, "%d месяц", "%d месяца", "%d месяцев"); },
+      year: "год",
+      years: function(value) { return numpf(value, "%d год", "%d года", "%d лет"); }
+    };
+  })();
+}
+
+function loadYoungOldYears() {
+  jQuery.extend(jQuery.timeago.settings.strings, {
+    years: function(value) { return (value < 21) ? "%d young years" : "%d old years"; }
+  });
+}