Correct a misspelled property in the contents page script

The last branch of `initialize()` tested `navigator.appnName`, which
does not exist and would have thrown had it been reached.  It is not
reached in practice, since every current browser reports `appName` as
"Netscape" and the first branch always wins, but the check was wrong
just the same.

Author: gennaroprota

doc/index.html

@@ -66,7 +66,7 @@
     collapse_all();
   }
   else
-  if (navigator.appnName.indexOf("Konqueror") >= 0){
+  if (navigator.appName.indexOf("Konqueror") >= 0){
     document.onclick = clickHandlerIE;
     collapse_all();
   }