* Nikkei 225 Stock Average: +52.76 (+0.3%) to 18,221.48; intra-day high of 18,295.27 vs. 2/26/07 intra-day high of 18,300.39 * Nikkei 225 futures Osaka: +50 (+0.3%) to 18,240, Singapore (SGX) 18,250, Chicago (CME) 7/03 — 18,250 * TOPIX: +5.72 (+0.3%) to 1,788.16; Advancers 976 x decliners 592 (unchanged 163), New highs 71 x new lows [...]