diff -Naur HTMLArea-3.0-beta/popupwin.js HTMLArea-3.0-beta-patched/popupwin.js
--- HTMLArea-3.0-beta/popupwin.js	2003-08-11 17:30:12.000000000 -0400
+++ HTMLArea-3.0-beta-patched/popupwin.js	2003-09-20 12:45:54.000000000 -0400
@@ -9,10 +9,7 @@
 	this.doc = doc;
 	var self = this;
 
-	var base = document.baseURI || document.URL;
-	if (base && base.match(/(.*)\/([^\/]+)/)) {
-		base = RegExp.$1 + "/";
-	}
+	var base = editor.config.editorURL;
 	this.baseURL = base;
 
 	doc.open();