Main character is named Aesop.
Under the "Z" key press event:
if !place_free(x,y+1){
vspeed = -9}
if hspeed = -6{
sprite_index = aesop_jump_left}
if hspeed = 6{
sprite_index = aesop_jump_right}
if sprite_index = aesop_stand_right{
sprite_index = aesop_njump_right}
if sprite_index = aesop_stand_left{
sprite_index = aesop_njump_left}