// Predeclare Images

        if (document.images)
        {
		
				biography = new Image();
                biography.src = "assets/nav/biography.gif";
                biography_on = new Image();
                biography_on.src = "assets/nav/biographyx.gif";
				
				services = new Image();
                services.src = "assets/nav/services.gif";
                services_on = new Image();
                services_on.src = "assets/nav/servicesx.gif";
				
				keynotes = new Image();
                keynotes.src = "assets/nav/keynotes.gif";
                keynotes_on = new Image();
                keynotes_on.src = "assets/nav/keynotesx.gif";
				
				books = new Image();
                books.src = "assets/nav/books.gif";
                books_on = new Image();
                books_on.src = "assets/nav/booksx.gif";
				
				workshops = new Image();
                workshops.src = "assets/nav/workshops.gif";
                workshops_on = new Image();
                workshops_on.src = "assets/nav/workshopsx.gif";
				
				clients = new Image();
                clients.src = "assets/nav/clients.gif";
                clients_on = new Image();
                clients_on.src = "assets/nav/clientsx.gif";
				
				contact = new Image();
                contact.src = "assets/nav/contact.gif";
                contact_on = new Image();
                contact_on.src = "assets/nav/contactx.gif";
				
				home = new Image();
                home.src = "assets/nav/home.gif";
                home_on = new Image();
                home_on.src = "assets/nav/homex.gif";
	
            }
			


//  Function for Image On or Off

function change(img,act)
{ if (document.images) 
  { if (act=="on")  
    { document [img].src = eval(img+'_on.src'); 
     } 
    else
    { document [img].src = eval(img+'.src');} 
  } 
}