if (document.images) { // Active Images

	 img1on = new Image();
	 img1on.src = "/images/nava_07.gif";
	 img2on = new Image();
	 img2on.src = "/images/nava_08.gif";
	 img3on = new Image();
	 img3on.src = "/images/nava_09.gif";
	 
	 
	 img1off = new Image();
	 img1off.src = "/images/nav_07.gif";
	 img2off = new Image();
	 img2off.src = "/images/nav_08.gif";
	 img3off = new Image();
	 img3off.src = "/images/nav_09.gif";
	 
}
// 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");
}
}