Supports: Nifty is certainly critically poised in near term. On one hand it's nearing positional support levels and waiting for a correction against the fall, and on other hand it's behavior near resistance levels will determine the bulls strength. Main support lies @ 5155, below which it can go deep down towards 5110/5100, which is also a serious support zone.
Resistances: 5250 and 5290 is real serious resistances. Correction against fall can bring these levels but close above those will bring more strength to bull's activity.