Indexing Problem..

Hi there,
   This is my probs...below

There r 2 list boxes.

window onLoad

1.First list box is loaded from an xml file.

2.Next the second list box is loaded from another xml file.

3.Then a function is called for removing the options which r present in the
second list box from first list box (ie to remove duplicate options from the
first list box).

Onpage load it gives error invalid index.

but if an alert message is given it works properly without error.



Looking for a help

Regards
Sachi


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