So much time spent and found it here. However, space, indent ...etc. enter.... is challenges!
import os, arcpy, arcpy.mapping
from arcpy import env
mxd = arcpy.mapping.MapDocument("Current")
lstas = arcpy.mapping.ListLayers(mxd,"*.img")
for las in lstas:
arcpy.ApplySymbologyFromLayer_management (las, r"C_RE.lyr\20101105t045002_01_or_mo.img")