I'm sorry but SliderWall doesn't have an option which allows you to use "dynamic images".
However you might be able to obtain what you need if you will create your own script(in php for example) which will load the SliderWall gallery according with what images your folder "Images_New" contains.
However you might be able to obtain what you need if you will create your own script(in php for example) which will load the SliderWall gallery according with what images your folder "Images_New" contains.