// Rollover images
       
if (document.images) {
	
	nav1on = new Image();          
	nav1on.src = "images/nav_home_over.gif";       // Active Images
	nav2on = new Image(); 
	nav2on.src = "images/nav_services_over.gif";
	nav3on = new Image(); 
	nav3on.src = "images/nav_background_over.gif"; 
	nav4on = new Image(); 
	nav4on.src = "images/nav_contact_over.gif"; 
	
	
	nav1off = new Image();         
	nav1off.src = "images/nav_home.gif";     // Inactive Images
	nav2off = new Image(); 
	nav2off.src = "images/nav_services.gif"; 
	nav3off = new Image(); 
	nav3off.src = "images/nav_background.gif";
	nav4off = new Image(); 
	nav4off.src = "images/nav_contact.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");
        }       
}