diff -urN BUILD/Ajaxterm-0.10/sarissa.js BUILD.1/Ajaxterm-0.10/sarissa.js
--- BUILD/Ajaxterm-0.10/sarissa.js	2006-10-29 15:52:39.000000000 +1300
+++ BUILD.1/Ajaxterm-0.10/sarissa.js	2012-01-17 04:05:55.498421522 +1300
@@ -265,7 +265,13 @@
             * <li>3 == INTERACTIVE,</li>
             * <li>4 == COMPLETED</li></ul>
             */
-            XMLDocument.prototype.readyState = 0;
+	    try {
+	        XMLDocument.prototype.readyState = 0;
+	    } catch(e) {
+                // XXX on some browsers (Firefox 3.6 at least) this fails,
+                // however I think this is rarely a problem so we just
+                //  ignore it here...
+	    };
             /**
             * <p>Emulate IE's parseError attribute</p>
             */