Adding JAVA script to a player button changing an variable.

Hi all,

I want to add a button in the player that toggles a layer on all pages in the course.

Meaning that if the button is selected the layer should be shown, if the button is setelected again the layer should be hidden.

I have the specific layer that should be shown on each page, does anyone know if it is possible to use a layer on the Master page?

I have created a True/False variable that i wanted to use for this.

Thanks for all the JAVA script suggestions

/Mats