namedItem not working in Safari

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Javascript

.NET

Hi,
I am unable to retrieve an item using namedItem in Safari
The following worked in IE but not in Safari . In IE the table with "table1" is correctly returned but in Safari the first table is returned.
var x = document.getElementsByTagName("table").namedItem("table1");
Please tell me how to fix it in Safari and IE without having to loop through items.

Thanks ,
Sarah