Improve javascript onload handling.

I noticed the onload hook running twice sometimes when using chromium.
Change from using arguments.callee.done to a onload_done variable fixed it.
I guess that the callee differed in chromium.

Probably the cause of the problem is that chrome supports both
window.onload and document.addEventListener.

debian/changelog

@@ -3,6 +3,7 @@ ikiwiki (3.20091203) UNRELEASED; urgency=low
   * cvs: Add missing bit to Automator.
   * Add complete Spanish basewiki translation done by Fernando Gonzalez de
     Requena.
+  * Improve javascript onload handling.
 
  -- Joey Hess <joeyh@debian.org>  Wed, 02 Dec 2009 17:22:21 -0500
 

underlays/javascript/ikiwiki.js

@@ -10,11 +10,13 @@ if (document.addEventListener) {
 // other browsers
 window.onload = run_hooks_onload;
 
+var onload_done = 0;
+
 function run_hooks_onload() {
 	// avoid firing twice
-	if (arguments.callee.done)
+	if (onload_done)
 		return;
-	arguments.callee.done = true;
+	onload_done = true;
 
 	run_hooks("onload");
 }