// main menu
mn01_off = new Image();
mn01_off.src = "images/mn01_off.png";
mn01_on = new Image();
mn01_on.src = "images/mn01_on.png";

mn02_off = new Image();
mn02_off.src = "images/mn02_off.png";
mn02_on = new Image();
mn02_on.src = "images/mn02_on.png";

mn03_off = new Image();
mn03_off.src = "images/mn03_off.png";
mn03_on = new Image();
mn03_on.src = "images/mn03_on.png";

mn04_off = new Image();
mn04_off.src = "images/mn04_off.png";
mn04_on = new Image();
mn04_on.src = "images/mn04_on.png";