if (document.images) {
	img1on = new Image();           // Active images
	img1on.src = "img/rll_carla_on.gif";
	img2on = new Image();
	img2on.src = "img/rll_on_rob.gif";
	img3on = new Image();
	img3on.src = "img/rll_mark_on.gif";


	img1off = new Image();          // Inactive images
	img1off.src = "img/rll_carla_off.gif";
	img2off = new Image();
	img2off.src = "img/rll_off_rob.gif";
	img3off = new Image();
	img3off.src = "img/rll_mark_off.gif";
}

function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}