diff --git a/js/top/run b/js/top/run
new file mode 100644
index 0000000..fd6ae5a
--- /dev/null
+++ b/js/top/run
@@ -0,0 +1,45 @@
+#!/usr/bin/node
+global.TOP='/home/sbosse/proj/jam/js';
+var debug=false;
+require(TOP+'/top/module')([process.cwd(),TOP]);
+
+function out(str) {console.log(str);};
+function dump() {
+        var e = new Error('dummy');
+        var stack = e.stack.replace(/^[^\(]+?[\n$]/gm, '')
+            .replace(/^\s+at\s+/gm, '')
+            .replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@')
+            .split('\n');
+        out('Stack Trace');
+        out('--------------------------------');
+        for(var i in stack) {
+            if (i>0) {
+                var line = stack[i];
+                if(line.indexOf('Module.',0)>=0) break;
+                out(line);
+            }
+        }
+        out('--------------------------------');
+};
+
+if (process.argv[2]) {
+  if (process.argv[2]=='-d') {
+    debug=true;
+    process.argv.shift();
+  }
+  process.argv.shift();
+  var exec=process.argv[1];
+  process.argv.shift();
+  if (debug)
+    Require(exec);
+  else try {
+    Require(exec);
+  } catch (e) {
+    out(e);
+  }
+} else {
+  console.log('usage: run [-d] <javascript main file>');
+  console.log('       -d: Dump a stack trace on uncaught exceptions');
+  console.log('       TOP='+TOP);
+}
+