Dead Dakota… :(

:help:
I have a 98 5.2l 4 x 2 Dakota that died after taking my daughter to school. I drove her to school and parked it. Walked her to the front door & went back to the truck. When I got in the truck & tried to turn it over I got nothing.... completely dead. Head lights are orange. I tried to jump it & it wont start; it does turns over though. So my question is: battery or alternator? Any ideas?