if (document.images) {            // Active Images
            img1on = new Image();      
            img1on.src = "picture/themes/intro/introv2_on_12.jpg"; 
            img2on = new Image(); 
            img2on.src = "picture/themes/intro/introv2_on_13.jpg";  
            img3on = new Image(); 
            img3on.src = "picture/themes/intro/introv2_on_14.jpg"; 
			img4on = new Image();          
            img4on.src = "picture/themes/intro/introv2_on_15.jpg";
            img5on = new Image();          
            img5on.src = "picture/themes/intro/introv2_on_16.jpg";
          
            img1off = new Image(); 
            img1off.src = "picture/themes/intro/introv2_12.jpg"; 
            img2off = new Image();          
            img2off.src = "picture/themes/intro/introv2_13.jpg"; 
            img3off = new Image();          
            img3off.src = "picture/themes/intro/introv2_14.jpg";
            img4off = new Image();          
            img4off.src = "picture/themes/intro/introv2_15.jpg";
            img5off = new Image();          
            img5off.src = "picture/themes/intro/introv2_16.jpg";
            				
}

// 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");
        }
}