Hi
I didn't think AutoCAD LT supported LISP without some Third Party piece of Software that enables ARX, LISP, VBA etc functions/routines to be run....
The following should work as it uses Diesel (which I believe is available within vanilla AutoCAD LT) -
^C^C_.Select;\_.Change;_P;;_P;_LA;$M=$(getvar,CLAYER);;
Have a good one, Mike