Here is a suggested (untested) code to try. You may have to play with the numbers a bit, but it should get you started.
Code:

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function turn_toward_target
{
	var original_direction[3];
	var new_direction[3];
	var pan_difference;
	var pan_direction;
	
	vec_set(original_direction,my.pan);
	vec_set(temp,your.pos);
	vec_sub(temp,my.pos);
	vec_to_angle(new_direction,temp);
	
	pan_difference = (360-new_direction.x) - (360-original_direction.x);
	if((pan_difference > 0) && (abs(pan_difference) < 180))
	{
		pan_direction = 1;
	}
	else
	{
		pan_direction = -1;
	}
	
	while(my.pan != new_direction.x)
	{
		my.pan += pan_direction; // adjust angle increment by multiplying with 0.1 .. 10
		wait(-time_step); // adjust turn speed by multiplying with 0.01 .. 100
		wait(1);
	}
}
  

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