diff --git a/js-assembler/runtime-src/baselib-format.js b/js-assembler/runtime-src/baselib-format.js
index 752b444..de49eb6 100644
--- a/js-assembler/runtime-src/baselib-format.js
+++ b/js-assembler/runtime-src/baselib-format.js
@@ -209,9 +209,22 @@
                 this[k] = params[k];
             }
         }
-        this.objectCounter = 0;
+        if (this.depth === undefined) {
+            this.depth = 0;
+        }
+        if (this.objectCounter === undefined) {
+            this.objectCounter = 0;
+        }
     };
 
+
+    ToDomNodeParameters.prototype.incrementDepth = function() {
+        return new ToDomNodeParameters({ mode : this.mode,
+                                         depth: this.depth + 1,
+                                         objectCounter: objectCounter });
+    };
+    
+
     // getMode: -> (U "print" "display" "write")
     ToDomNodeParameters.prototype.getMode = function() {
         if (this.mode) { 
@@ -241,6 +254,10 @@
         return this.cache.put(x, this.objectCounter);
     };
 
+    ToDomNodeParameters.prototype.recur = function(x) {
+        return toDomNode(x, this.incrementDepth());
+    };
+
 
 
     // rationalToDomNode: rational -> dom-node