This is what I did and it still didn't work.
Code:
if(key_space == 1 && key_space == 0)
	      {
	      	key_space = 0;
	      	jump_target = jump_height * time_step;
	     
	     	   
	      }
	      if(dist_down < 0 && key_space == 0)
	      {
	      	key_space = 1;
      	}


I didn't do key_space_released because it couldn't find it so what I did was just say key_space off and on. But what it is doing is just hopping around when I hold the key.