Mine

public void OnDoubleClick(Mobile from){
	if(this.Parent == from){
		from.Backpack.AddItem(this);
	} else {
		if((from.InRange((this), 4) && from.CanSee(this)) || this.RootParent = from){
			if(this.Layer == Layer.OneHanded || this.Layer == Layer.TwoHanded) {
				Item oneh = from.FindItemOnLayer(Layer.OneHanded);
				Item twoh = from.FindItemOnLayer(Layer.TwoHanded);
				switch(this.Layer){
					case Layer.OneHanded: {
						if(twoh != null && twoh is BaseWeapon)
							from.Backpack.AddItem(twoh);
						if(oneh != null)
							from.Backpack.AddItem(oneh);
						from.EquipItem(this);
						break;
					}
					case Layer.TwoHanded: {
						if(oneh != null && this is BaseWeapon)
							from.Backpack.AddItem(oneh);
						if(twoh != null)
							from.Backpack.AddItem(twoh);
						from.EquipItem(this);
					}
					
				}
			} else {
				Item eq = from.FindItemOnLayer(this.Layer);
				if(eq != null)
					from.Backpack.AddItem(eq);
				from.EquipItem(this);
			}	
		}
	}
}