if (document.images) {
// Active Images
    imgcompanion_1on = new Image();                       
    imgcompanion_1on.src = "images/splash/button-e-on.jpg";  
    imgcompanion_2on = new Image();                       
    imgcompanion_2on.src = "images/splash/button-f-on.jpg"; 

// Inactive Images
    imgcompanion_1off = new Image();                       
    imgcompanion_1off.src = "images/splash/button-e-off.jpg";  
    imgcompanion_2off = new Image();                       
    imgcompanion_2off.src = "images/splash/button-f-off.jpg"; 
}

// Function to 'activate' images.
function imgMenuOn(imgName) {
	if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

// Function to 'deactivate' images.
function imgMenuOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}