image_1aon = new Image(256, 158);
image_1aon.src = "cooking-for-one-2.jpg"; 

image_1aoff = new Image(256, 158);
image_1aoff.src = "cooking-for-one-1.jpg";

image_3aon = new Image(256, 158);
image_3aon.src = "biofeedback-2.jpg"; 

image_3aoff = new Image(256, 158);
image_3aoff.src = "biofeedback-1.jpg";

// FUNCTIONS
function
img_act(imgName) {
imgon = eval(imgName + "on.src");
document [imgName].src = imgon;
}
function
img_inact(imgName) {
imgoff = eval(imgName + "off.src");
document [imgName].src = imgoff;
}