if (document.images) {            // Active Images
	img1on = new Image();      
    img1on.src = "resources/control_line_on.gif"; 
	img2on = new Image(); 
    img2on.src = "resources/downhole_cables_on.gif"; 
	img3on = new Image(); 
    img3on.src = "resources/protectors_on.gif"; 
	img4on = new Image(); 
    img4on.src = "resources/safety_strip_on.gif"; 
	img5on = new Image(); 
    img5on.src = "resources/contact_us_on.gif"; 
	img6on = new Image(); 
    img6on.src = "resources/home_on.gif"; 
    
    
         
    img1off = new Image(); 
    img1off.src = "resources/control_line.gif"; 
	img2off = new Image(); 
    img2off.src = "resources/downhole_cables.gif"; 
	img3off = new Image(); 
    img3off.src = "resources/protectors.gif"; 
	img4off = new Image(); 
    img4off.src = "resources/safety_strip.gif"; 
	img5off = new Image(); 
    img5off.src = "resources/contact_us.gif";
	img6off = new Image(); 
    img6off.src = "resources/home.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");
        }
}
// -->