Shares at PSX climb 800 points after IMF announcement / Shares at PSX climb 800 points on positive economic outlook / Shares at PSX reverse gains after upward start as Pakistan-India tensions loom / Shares at PSX reverse gains after upward start / Shares at PSX climb 900 points on strong corporate results from heavyweights / One of UK's largest companies sees PS2bn wiped off shares through north American market weakness / Shares at PSX reach all-time high before reversing gains / Shares at PSX surge 1,200 points in intraday trade, crossing 119,000 barrier in new high / Shares at PSX rally over 600 points on hopes of IMF staff-level agreement soon / Shares at PSX rally more than 1,000 points in intraday trade