diff --git openads.js openads.js
index fca4dff..54669c9 100644
--- openads.js
+++ openads.js
@@ -1,16 +1,31 @@
-var m3_up=location.protocol=='https:'?'https://':'http://';
-var m3_url=m3_up=='https:'?az_us:az_u;
-var m3_u=m3_up + m3_url + az_js;
-var m3_r=Math.floor(Math.random()*99999999999);
-if (!document.MAX_used) document.MAX_used = ',';
+// $Id$
+
+// @todo Remove global variables.
+if (typeof az_js != 'undefined') {
+  var m3_up = (location.protocol == 'https:' ? 'https://' : 'http://');
+  var m3_url = (m3_up == 'https:' ? az_us : az_u);
+  var m3_u = m3_up + m3_url + az_js;
+  var m3_r = Math.floor(Math.random() * 99999999999);
+  if (!document.MAX_used) {
+    document.MAX_used = ',';
+  }
+}
 
 function az_adjs(z, n) {
-  var az="<scr"+"ipt type='text/javascript' ";
-  az+="src='"+m3_u+"?zoneid="+z+"&amp;withtext="+az_wt+"&amp;cb="+m3_r;
-  if (!document.MAX_used != ',') az+="&amp;exclude="+document.MAX_used;
-  if (document.referrer) az+="&amp;referer="+escape(document.referer);
-  if (document.content) az+="&context="+escape(document.context);
-  if (document.mmm_fo) az+="&amp;mmm_fo=1";
-  az+="'></scr"+"ipt>";
+  var az = "<scr" + "ipt type='text/javascript' ";
+  az += "src='" + m3_u + "?zoneid=" + z + "&amp;withtext=" + az_wt + "&amp;cb=" + m3_r;
+  if (!document.MAX_used != ',') {
+    az += "&amp;exclude=" + document.MAX_used;
+  }
+  if (document.referrer) {
+    az += "&amp;referer=" + escape(document.referer);
+  }
+  if (document.content) {
+    az += "&context=" + escape(document.context);
+  }
+  if (document.mmm_fo) {
+    az += "&amp;mmm_fo=1";
+  }
+  az += "'></scr" + "ipt>";
   document.write(az);
 }