if (document.images) {            // Active Images
	  
            img1on = new Image();      
            img1on.src = "../../hannah/gallery/cat_detail.jpg"; 
		
			img1off = new Image();      
            img1off.src = "../../hannah/gallery/cat.jpg"; 
			
        }
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");
        }
}