Search for:
background = lines[0].rpartition("background ")[2].partition(";")[0]
backgroundTop = lines[1].rpartition("backgroundTop ")[2].partition(";")[0]
backgroundBottom = lines[2].rpartition("backgroundBottom ")[2].partition(";")[0]
and change lines[0] to lines[67],lines[1] to lines[68] and lines[2] to lines[69]