FRANKFURT (AFX) - Shares were higher in midday trade, amid US gains on Friday and as Gerhard Schroeder's Social Democrats announced they have agreed that conservative Christian Democrat leader Angela Merkel should replace him as chancellor at the head of a coalition government, dealers said. At 11.40 am, the DAX 30 index was at a session high, up 49.36 points or 0.99 pct at 5,057.13, having moved between 5,027.28-5,057.13 so far this session. The MDAX was at 7,023.10, up 52.24 points or 0.75 pct, while the TecDAX was at 603.32, up 3.64 points or 0.61 pct. The DAX future was...