Well i got the solution...
I have a opener window and a pop-up window, and there code given below.
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//onload function
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function openPopUp(){
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window.open(......);
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}
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//add-list handler
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function addList(){
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var parent_UL_ref = opener.document.getElementById(..) ; //get the opener UL reference
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var child_LI_ref = document.createElement('LI');
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parent_UL_ref.appendChild(child_LI_ref); //here it says no such interface supported
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}
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Up to this the whole code works in Mozilla but not in IE.
if i change the code like this ....
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var child_LI_ref = opener.document.createElement('LI');
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Then it works in both ;)