Euro Hits Session Highs Vs Dollar Following S&p/case-Shiller Report

*BoE's Posen: Need Further Monetary Action To Sustain, Promote Recovery

*Pound Slides Against Majors; Hits 4-day Low Of 0.8537 Against Euro

Oman C.bank Head Says No Debt Issues Planned at Moment

Mexico's Peso Gains 0.68 Pct to 12.5022 Per Dollar After Us Home Prices Data