Tokyo  - Japan's key Nikkei 225 Stock Average opened moderately higher in mixed-trading Wednesday as investors bought back shares on the US dollar's advance against the yen.

The Nikkei index gained 5.17 points, or 0.04 per cent, to 14,026.34.

But the broader Topix index of all first-section issues dipped 5.69 points, or 0.41 per cent, at 1,383.2.

On currency markets at midday (0300 GMT), the dollar was quoted at 107.34-39 yen, up from Tuesday's 5 pm quote of 106.64-67 yen.

The euro was quoted at 1.5459-64 dollars, down from Tuesday's 5 pm quote of 1.5572-75 dollars, and at 165.96-166.01 yen, down from 166.09-13 yen. (dpa)