Проблема с функции с привязкой к окну

win wind;
wind=window ("BlueStacks Android PluginAndroid", -1, window ("BlueStacks", -1, -1));

function mousewheel(win wind, int x, int y, int delta)
{
sendmessage(WM_MOUSEWHEEL, delta*120*65536, x+y*65536, wind);
}

mousewheel(wind, 247, 296, -2); // - вниз без минуса вверх

mousewheel(wind, 110+wind.leftclient, 140+wind.topclient, -2);

function mousewheel(win wind, int x, int y, int delta){
x=x+wind.leftclient;
y=y+wind.topclient;
sendmessage(WM_MOUSEWHEEL, delta*120*65536, x+y*65536, wind);
}