Median of two sorted arrays

Here are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).

http://www.ihas1337code.com/2011/03/median-of-two-sorted-arrays.html
http://www.geeksforgeeks.org/archives/2105

http://techpuzzl.wordpress.com/2009/08/26/how-to-efficiently-find-the-median-value-of-two-sorted-lists/