cables reversed during jump start attempt

Update: Had power to the starter relay solenoid from the battery and power from the ignition when key turned to start, but no power to starter- jumping across the large terminals kicked over the engine. Installed a new starter relay solenoid and the engine fired right up, minus output from the alternator. Alternator tested bad, and while installing a new one noticed a hairline crack and small leak from the engine thermostat housing. Of course one of the bolts broke off, thankfully above the block, and with a little tapping from a hammer and heat from a tourch I was able to get it out with a vicegrip. Neither Ford nor NAPA shows a listing for a new thermostat housing, so thanks to Autozone I should be back in business today. Thanks to everyone for your input and suggestions- couldn't have done it without you!