Slideshow back button problem

Hello

I have created a slideshow using Edge Animate and it has a set of selected pictures (number of pictures wont increase for now) and they change automatically after 5 seconds. The slideshow also includes two buttons: Next and Back. The next button works fine, it has the following code:

sym.play();

Simple as that. I thought that sym.playReverse(); would solve my problem for the back button, but it didn't. It just goes back to the previous pic and stays there for not even a second and then goes forward again. I want to delay this back button to the normal delay time which is 5 seconds. So when someone clicks back, he gets to the previous picture and stays there for 5 seconds.

Just for reference purposes, here is my code that automatically "slides" the pictures after 5 seconds automatically:

sym.stop();
setTimeout(function(){sym.play();},5500);

Each picture (label-ed) has this code.

So how do I make my back button work as it should?

Thank you.