get a common parent for two DOM elements [duplicate]

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Possible Duplicate:

How to find the nearest common ancestors of two or more nodes?

I have 2 anchor elements and i need to get the common parent of 2 of them.

Some times they are in a ul, sometimes in a table, or any other way.

I am doing this:

var idParent = $(elem1).parents().filter($(elem2).parents()).first().attr('id');

But it doesnt always work, i finds it element sometimes...

Any better idea? or a way to fix this?

EDIT: I want a jquery solution.

Thank you

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var parent = $(elem1).parents().has(elem2).first();