if (document.images) { 

         img1on = new Image();      
			img1on.src = "/imgs/lk_wedding-photographyON.png"; 
			img2on = new Image();      
			img2on.src = "/imgs/lk_portrait-photographyON.png"; 
			img3on = new Image();      
			img3on.src = "/imgs/lk_commercial-photographyON.png";
            
         img1off = new Image();      
			img1off.src = "/imgs/lk_wedding-photography.png"; 
			img2off = new Image();      
			img2off.src = "/imgs/lk_portrait-photography.png";
			img3off = new Image();      
			img3off.src = "/imgs/lk_commercial-photography.png";
        }

// Images turn on.

function imgOn(imgName) {

        if (document.images) {

            document[imgName].src = eval(imgName + "on.src");

        }

}

// Images turn off.

function imgOff(imgName) {

        if (document.images) {

            document[imgName].src = eval(imgName + "off.src");

        }

}