Finding the image of an element under an automorphism by GAP

Question

I am doing GAP to find the image of an element under an automorphism of a certain group:

a4:=Group((1,2,3),(1,2)(3,4));
e:=Elements(a4);
w:=Elements(AutomorphismGroup(a4));;
t:=AsGroupGeneralMappingByImages(w[2]);
Image(t,e[5]);

the answer is (1,3,4). Am I on a right way? Thanks for your help, my friends.