Nikkei stabilises after selloff, market cautious before U.S. payrolls

* Market cautious before U.S. payroll report * Index-heavy weights up on hopes Nikkei will rise mid-term - fund manager * Volatile currency market keeps investors on edge - analyst By Ayai Tomisawa TOKYO, Dec 6 (Reuters) - Japanese stocks got some respite from two days of sharp falls on Friday morning, as investors bought index heavyweights such as SoftBank Corp and futures although trading was subdued ahead of the looming U.S. jobs data. The Nikkei tacked on 0.2 percent to