if (document.images) {             
            
            profileoff = new Image();      
            profileoff.src = "/images/nav_index_profile_off.gif"; 
            
            profileon = new Image();      
            profileon.src = "/images/nav_index_profile_on.gif";
        
            
            constructionoff = new Image();      
            constructionoff.src = "/images/nav_index_construction_off.gif"; 

            constructionon = new Image();      
            constructionon.src = "/images/nav_index_construction_on.gif";
        
            
            equipmentoff = new Image();      
            equipmentoff.src = "/images/nav_index_equipment_off.gif"; 

            equipmenton = new Image();      
            equipmenton.src = "/images/nav_index_equipment_on.gif";            

            contactoff = new Image();      
            contactoff.src = "/images/nav_index_contact_off.gif"; 

            contacton = new Image();      
            contacton.src = "/images/nav_index_contact_on.gif";
            
            homeoff = new Image();      
            homeoff.src = "/images/nav_index_home_off.gif"; 

            homeon = new Image();      
            homeon.src = "/images/nav_index_home_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");
        }
}