integer iButtonCount = 16;
integer iPictureFrameRows = 4;
integer iPictureFrameColumns = 5;
integer iTouchFace = 1;


string sButton = "Button #";
fButton(integer i)
{
    llWhisper(PUBLIC_CHANNEL, sButton+(string)i);
}
default
{
    state_entry()
    {
    }

    touch_start(integer total_number)
    {
        vector vPUV = llDetectedTouchST(0);
        if (llDetectedTouchFace(0) == iTouchFace)
        {
            integer iHorizontal = llFloor(iPictureFrameRows*vPUV.x);
            integer iVertikal = llFloor(iPictureFrameColumns* (1-vPUV.y));
            integer iBild = 1 + iHorizontal + iVertikal * iPictureFrameRows;
            if (iBild <= iButtonCount)
            {
                fButton(iBild);
            }
        }
    }
}