Palestinian protesters have smashed windows and sprayed graffiti outside the headquarters of the Al-Jazeera TV channel in the West Bank.Al-Jazeera aired late Sunday what it said were leaked documents showing that Palestinian leaders agreed to deep concessions on two of the thorniest issues in negotiations with Israel: Jerusalem and the fate of Palestinian refugees.Senior Palestinian official Yasser Abed Rabbo accused the station on Monday of misleading viewers to discredit Palestinian leaders.About 250 protesters gathered outside Al-Jazeera' seventh floor office in Ramallah on Monday. A small group then broke security cameras, windows and station logos outside the building. The graffiti read "Al-Jazeera are spies," and "Al-Jazeera equals Israel."Police removed them and prevented people from entering the building.