diff --git a/ase/lib/utl/assert.c b/ase/lib/utl/assert.c
new file mode 100644
index 00000000..b2bf98d2
--- /dev/null
+++ b/ase/lib/utl/assert.c
@@ -0,0 +1,48 @@
+/*
+ * $Id$
+ *
+ * {License}
+ */
+
+#ifndef NDEBUG
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#ifdef _WIN32
+#include <windows.h>
+#include <tchar.h>
+#endif
+
+void ase_assert_abort (void)
+{
+	abort ();
+}
+
+void ase_assert_printf (const ase_char_t* fmt, ...)
+{
+	va_list ap;
+#ifdef _WIN32
+	int n;
+	ase_char_t buf[1024];
+#endif
+
+	va_start (ap, fmt);
+#if defined(_WIN32)
+	n = _vsntprintf (buf, ASE_COUNTOF(buf), fmt, ap);
+	if (n < 0) buf[ASE_COUNTOF(buf)-1] = ASE_T('\0');
+
+	#if defined(_MSC_VER) && (_MSC_VER<1400)
+	MessageBox (NULL, buf, 
+		ASE_T("Assertion Failure"), MB_OK|MB_ICONERROR);
+	#else
+	MessageBox (NULL, buf, 
+		ASE_T("\uB2DD\uAE30\uB9AC \uC870\uB610"), MB_OK|MB_ICONERROR);
+	#endif
+#else
+	ase_vprintf (fmt, ap);
+#endif
+	va_end (ap);
+}
+#endif
diff --git a/ase/lib/utl/http.c b/ase/lib/utl/http.c
index 31fd54e7..c16c7d15 100644
--- a/ase/lib/utl/http.c
+++ b/ase/lib/utl/http.c
@@ -1,5 +1,7 @@
 /*
- * $Id: http.c 116 2008-03-03 11:15:37Z baconevi $
+ * $Id: http.c 186 2008-06-03 09:00:14Z baconevi $
+ * 
+ * {License}
  */
 
 #include <ase/utl/http.h>
diff --git a/ase/lib/utl/makefile.in b/ase/lib/utl/makefile.in
index 8f915ee2..68ca05c8 100644
--- a/ase/lib/utl/makefile.in
+++ b/ase/lib/utl/makefile.in
@@ -23,7 +23,8 @@ OBJ_FILES = \
 	$(TMP_DIR)/ctype.o \
 	$(TMP_DIR)/stdio.o \
 	$(TMP_DIR)/http.o \
-	$(TMP_DIR)/getopt.o 
+	$(TMP_DIR)/getopt.o \
+	$(TMP_DIR)/assert.c
 
 lib: $(OUT_FILE)
 
@@ -46,6 +47,9 @@ $(TMP_DIR)/http.o: http.c
 $(TMP_DIR)/getopt.o: getopt.c
 	$(CC) $(CFLAGS) -o $@ -c getopt.c
 
+$(TMP_DIR)/assert.o: assert.c
+	$(CC) $(CFLAGS) -o $@ -c assert.c
+
 $(OUT_DIR):
 	mkdir -p $(OUT_DIR)