-call Mapping("-", "yyp:s/./-/g<RETURN>:let @/=''<RETURN>:<RETURN>")
-call Mapping("=", "yyp:s/./=/g<RETURN>:let @/=''<RETURN>:<RETURN>")
-
-" Change to ts=2 with \2.
-call Mapping("2", ":se ts=2<CR>:<CR>")
-" Change to ts=4 with \4.
-call Mapping("4", ":se ts=4<CR>:<CR>")
-" Change to ts=8 with \8.
-call Mapping("8", ":se ts=8<CR>:<CR>")
-" Change to ts=16 with \6.
-call Mapping("6", ":se ts=16<CR>:<CR>")
-" Change to ts=32 with \3.
-call Mapping("3", ":se ts=32<CR>:<CR>")
+call Mapping("-", "yyp:s/./-/g<CR>:let @/=''<CR>")
+call Mapping("=", "yyp:s/./=/g<CR>:let @/=''<CR>")
+
+fun! Tab_Width(width) "{{{2
+ exec "set sw=" . a:width
+ exec "set ts=" . a:width
+endfun "}}}2
+
+" Set 2-column tabs with \2.
+call Mapping("2", ":call Tab_Width(2)<CR>")
+" Set 4-column tabs with \4.
+call Mapping("4", ":call Tab_Width(4)<CR>")
+" Set 8-column tabs with \8.
+call Mapping("8", ":call Tab_Width(8)<CR>")
+" Set 16-column tabs with \6.
+call Mapping("6", ":call Tab_Width(16)<CR>")
+" Set 32-column tabs with \3.
+call Mapping("3", ":call Tab_Width(32)<CR>")