if (document.images) {             
            
            mainoff = new Image();      
            mainoff.src = "/images/subnav/navlef_main-off.gif"; 
            
            mainon = new Image();      
            mainon.src = "/images/subnav/navlef_main-on.gif";
                    
            historyoff = new Image();      
            historyoff.src = "/images/subnav/leftnav_history-off.gif"; 
            
            historyon = new Image();      
            historyon.src = "/images/subnav/leftnav_history-on.gif";
        
            
            companyoff = new Image();      
            companyoff.src = "/images/subnav/leftnav_company-info-off.gif"; 

            companyon = new Image();      
            companyon.src = "/images/subnav/leftnav_company-info-on.gif";
        
            
            ceoff = new Image();      
            ceoff.src = "/images/subnav/navlef_ce-off.gif"; 

            ceon = new Image();      
            ceon.src = "/images/subnav/navlef_ce-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");
        }
}