if (document.images) {            // Active Images
	  
            img1on = new Image();      
            img1on.src = "http://images.salon.com/ent/video_dog/src/vd_on.gif"; 
		
			img1off = new Image();      
            img1off.src = "http://images.salon.com/ent/video_dog/src/vd_off.gif"; 
			
        }
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");
        }
}