diff -rupN original/ru new/ru
--- original/ru	2010-02-03 15:03:33.192291584 +0300
+++ new/ru	2010-02-03 15:05:31.724716092 +0300
@@ -483,3 +483,28 @@ xkb_symbols "bak" {
 	
     include "level3(ralt_switch)"
 };
+
+// Serbian charecters added as third level symbols to Russian keyboard layout.
+
+partial default alphanumeric_keys
+xkb_symbols "serbian" {
+    include "ru(common)"
+    include "level3(ralt_switch)"
+
+    name[Group1]= "Russia - Serbian";
+
+    key <AE03> { [ 3, numerosign ] };
+    key <AE04> { [ 4, semicolon ] };
+    key <AE05> { [ 5, percent ] };
+    key <AE06> { [ 6, colon ] };
+    key <AE07> { [ 7, question ] };
+    key <AE08> { [ 8, asterisk ] };
+    key <AB10> { [ period, comma ] };
+    key <BKSL> { [ backslash, slash ] };
+    key	<AD01> { [ Cyrillic_shorti, Cyrillic_SHORTI, U458, U408 ] };
+    key	<AD06> { [ Cyrillic_en, Cyrillic_EN, U45A, U40A ] };
+    key	<AC08> { [ Cyrillic_el, Cyrillic_EL, U459, U409 ] };
+    key	<AC09> { [ Cyrillic_de, Cyrillic_DE, U45F, U40F ] };
+    key	<AC10> { [ Cyrillic_zhe, Cyrillic_ZHE, U452, U402 ] };
+    key	<AB02> { [ Cyrillic_che, Cyrillic_CHE, U45B, U40B ] };
+};
diff -rupN original/us new/us
--- original/us	2010-02-03 15:03:15.334804664 +0300
+++ new/us	2010-02-03 15:05:31.718054770 +0300
@@ -1051,3 +1051,25 @@ xkb_symbols "chr" {
 
     // End alphanumeric section
 };
+
+// Serbian charecters added as third level symbols to US keyboard layout.
+
+partial alphanumeric_keys
+xkb_symbols "serbian" {
+
+  name[Group1]= "USA - Serbian";
+
+  include "us"
+
+  key <TLDE> { [ grave, asciitilde ] };
+  key <AE06> { [ 6, dead_caron, asciicircum, asciicircum ] };
+  key <AC09> { [ l, L, U1C9, U1C8 ] };
+  key <AB06> { [ n, N, U1CC, U1CB ] };
+  key <AB01> { [ z, Z, U1C6, U1C5 ] };
+  key <AD03> { [ e, E, EuroSign, cent ] };
+  key <AC03> { [ d, D, dstroke, Dstroke ] };
+  key <AC11> { [ dead_acute, quotedbl, apostrophe, U315 ] };
+  key <SPCE> { [ space, space, nobreakspace, nobreakspace ] };
+
+  include "level3(ralt_switch)"
+};