--- a/lib/js/urweb.js	Tue Sep 15 16:06:12 2009 -0400
+++ b/lib/js/urweb.js	Tue Sep 15 16:27:24 2009 -0400
@@ -304,20 +304,22 @@
       runScripts(dummy);
       var table = x.parentNode;
 
-      var arr = dummy.getElementsByTagName("tbody");
-      firstChild = null;
-      var tbody;
-      if (arr.length > 0 && table != null)
-        tbody = arr[0];
-      else
-        tbody = dummy;
+      if (table) {
+        var arr = dummy.getElementsByTagName("tbody");
+        firstChild = null;
+        var tbody;
+        if (arr.length > 0 && table != null)
+          tbody = arr[0];
+        else
+          tbody = dummy.firstChild;
 
-      var next;
-      firstChild = document.createElement("script");
-      table.insertBefore(firstChild, x);
-      for (var node = tbody.firstChild; node; node = next) {
-        next = node.nextSibling;
-        table.insertBefore(node, x);
+        var next;
+        firstChild = document.createElement("script");
+        table.insertBefore(firstChild, x);
+        for (var node = tbody.firstChild; node; node = next) {
+          next = node.nextSibling;
+          table.insertBefore(node, x);
+        }
       }
     } else if (pnode == "tr") {
       var dummy = document.createElement("body");
@@ -325,10 +327,16 @@
       runScripts(dummy);
       var table = x.parentNode;
 
-      var arr = dummy.getElementsByTagName("tr");
-      firstChild = null;
-      if (arr.length > 0 && table != null) {
-        var tbody = arr[0], next;
+      if (table) {
+        var arr = dummy.getElementsByTagName("tr");
+        firstChild = null;
+        var tbody;
+        if (arr.length > 0 && table != null)
+          tbody = arr[0];
+        else
+          tbody = dummy.firstChild;
+
+        var next;
         firstChild = document.createElement("script");
         table.insertBefore(firstChild, x);
         for (var node = tbody.firstChild; node; node = next) {