diff --git a/markdown.php b/markdown.php
index 844cfd7..7a40cf9 100644
--- a/markdown.php
+++ b/markdown.php
@@ -1,6 +1,62 @@
-<?php
-// TODO markdown imple
-function decode_md($str) {
-    return $str;
-}
+<?php
+// TODO markdown imple
+function md($str) {
+  $text = '';
+  $lv = 0;
+  foreach ( explode ( "\n", $str ) as $t ) {
+    $nlv = 0;
+    if (startsWith ( '**** ', $t )) {
+      $t = substr ( $t, 5 );
+      $nlv = 4;
+    }
+    if (startsWith ( '*** ', $t )) {
+      $t = substr ( $t, 4 );
+      $nlv = 3;
+    }
+    if (startsWith ( '** ', $t )) {
+      $t = substr ( $t, 3 );
+      $nlv = 2;
+    }
+    if (startsWith ( '* ', $t )) {
+      $t = substr ( $t, 2 );
+      $nlv = 1;
+    }
+    if ($lv != $nlv) {
+      while ( $lv < $nlv ) {
+        $text .= '<ul>';
+        $lv ++;
+      }
+      while ( $lv > $nlv ) {
+        $text .= '</ul>';
+        $lv --;
+      }
+    }
+    if (startsWith ( $t, '!!!!! ' )) {
+      $t = '<h5>' . substr ( $t, 6 ) . '</h5>';
+    }
+    if (startsWith ( $t, '!!!! ' )) {
+      $t = '<h4>' . substr ( $t, 5 ) . '</h4>';
+    }
+    if (startsWith ( $t, '!!! ' )) {
+      $t = '<h3>' . substr ( $t, 4 ) . '</h3>';
+    }
+    if (startsWith ( $t, '!! ' )) {
+      $t = '<h2>' . substr ( $t, 3 ) . '</h2>';
+    }
+    if (startsWith ( $t, '! ' )) {
+      $t = '<h1>' . substr ( $t, 2 ) . '</h1>';
+    }
+    if ($lv == 0) {
+      $text .= $t;
+    } else {
+      $text .= '<li>' . $t . '</li>';
+    }
+    // var_dump ( $t );
+  }
+  while ( $lv > 0 ) {
+    $text .= '</ul>';
+    $lv --;
+  }
+  return $text;
+}
 ?>
\ No newline at end of file