Share prices on the Taiwan Stock Exchange gained slightly Thursday, with the weighted index moving up 14.65 points, or 0.19 percent, to close at 7,710.4, according to news reaching here from Taipei. The key barometer opened higher at 7,778.35 and moved between 7, 780.66 and 7,692.58 during the day's trading. A total of 6.03 billion shares changed hands on market turnover of 164.56 billion new Taiwan dollars (5.11 billion U.S. dollars). Five of the eight major stock categories lost ground, with construction issues down the most at 2.81 percent. Paper and pulp issues dropped 1.5 percent, textile stocks declined 1.28 percent, foodstuff issues were down 1.1 percent, and cement stocks decreased 0.68 percent. Three other major categories gained ground, with banking and financial shares up the most at 0.51 percent. Plastics and chemicals shares increased 0.36 percent and machinery and electronics shares advanced 0.29 percent. Gainers outnumbered losers 1,554 to 1,123, with 226 stocks unchanged. 