if (document.images) {            // Active Images
	services_on = new Image();
	services_on.src = "images/btn_services_1.jpg";
	services_off = new Image(); 
	services_off.src = "images/btn_services_0.jpg";
			
	about_on = new Image();
	about_on.src = "images/btn_about_1.jpg";
	about_off = new Image(); 
	about_off.src = "images/btn_about_0.jpg";
	
	questions_on = new Image();
	questions_on.src = "images/btn_questions_1.jpg";
	questions_off = new Image(); 
	questions_off.src = "images/btn_questions_0.jpg";
	
	downloads_on = new Image();
	downloads_on.src = "images/btn_downloads_1.jpg";
	downloads_off = new Image(); 
	downloads_off.src = "images/btn_downloads_0.jpg";

}

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

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