ACR MLG WRONG RWY TKOF AT PIE.

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WE WERE CLRED FOR TKOF ON RWY 35R AT PIE. WE MISTAKENLY LINED UP FOR AND DEPARTED ON RWY 4. TKOF WAS UNEVENTFUL; BUT WE REALIZED OUR ERROR WHEN WE NOTICED OUR DEP HDG WAS WRONG. I FEEL THE FOLLOWING FACTORS CONTRIBUTED TO THIS INCIDENT: 1) WE WERE ON A CHARTER FLT; OPERATING OUT OF AN OFF-LINE ARPT. BECAUSE OF THIS THE ARPT WAS NOT IN THE ACFT'S FLT MGMNT COMPUTER DATA BASE; NECESSITATING A CHANGE IN OUR NORMAL PROC OF ENTERING THE TKOF RWY IN THE COMPUTER FOR A VISUAL DEPICTION ON OUR EFIS DISPLAY. THIS ALSO CHANGED OTHER ACFT PROCS AND DISPLAYS; WHICH CAUSED A DISTR TO MY NORMAL HABIT PATTERNS. 2) THE FACT THAT THE APCH ENDS OF RWY 4 AND 35R ARE VERY CLOSE TO ONE ANOTHER. THE LESSON I HAVE LEARNED FROM THIS ISN'T A NEW ONE. NO MATTER HOW TECHNICALLY ADVANCED YOUR ACFT IS; NEVER FORGET THE BASICS. THE OLD HABIT OF CHKING THE HDG WHEN LINED UP ON THE RWY FOR TKOF SHOULD NOT BE REPLACED BY CHKING THE FANCY DISPLAYS FOR PRETTY PICTURES. ALSO; WHEN THINGS ARE OUT OF THE ORDINARY AND DISTRS ARE POSSIBLE; SLOW DOWN AND DOUBLECHK YOURSELF.