if (document.images) {             
            
            servicesoff = new Image();      
            servicesoff.src = "/images/subnav/leftnav_services-off.gif"; 
            
            serviceson = new Image();      
            serviceson.src = "/images/subnav/leftnav_services-on.gif";
        
            
            projectsoff = new Image();      
            projectsoff.src = "/images/subnav/leftnav_projects-off.gif"; 

            projectson = new Image();      
            projectson.src = "/images/subnav/leftnav_projects-on.gif";
        
            
            safetyoff = new Image();      
            safetyoff.src = "/images/subnav/navleft_safety-off.gif"; 

            safetyon = new Image();      
            safetyon.src = "/images/subnav/navleft_safety-on.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");
        }
}