if (document.images) {            // Active Images
			img1on = new Image();      
			img1on.src = "images/d/navigation/navigation_01_on.gif";
			img1off = new Image(); 
			img1off.src = "images/d/navigation/navigation_01_off.gif";	

			img2on = new Image();      
			img2on.src = "images/d/navigation/navigation_02_on.gif";
			img2off = new Image(); 
			img2off.src = "images/d/navigation/navigation_02_off.gif";
			
			img3on = new Image();      
			img3on.src = "images/d/navigation/navigation_03_on.gif";
			img3off = new Image(); 
			img3off.src = "images/d/navigation/navigation_03_off.gif";	

			img4on = new Image();      
			img4on.src = "images/d/navigation/navigation_04_on.gif";
			img4off = new Image(); 
			img4off.src = "images/d/navigation/navigation_04_off.gif";	

			img5on = new Image(); 
			img5on.src = "images/d/navigation/navigation_05_on.gif";
			img5off = new Image(); 
			img5off.src = "images/d/navigation/navigation_05_off.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");
        }
}