if (document.images) {
  home0 = new Image();
  home0.src  = 'graphics/home0.gif';
  home1 = new Image();
  home1.src = 'graphics/home1.gif';
  
  contact0 = new Image();
  contact0.src  = 'graphics/contact0.gif';
  contact1 = new Image();
  contact1.src = 'graphics/contact1.gif';
  
  about0 = new Image();
  about0.src = 'graphics/about0.gif';
  about1 = new Image();
  about1.src  = 'graphics/about1.gif';
  
  forward0 = new Image();
  forward0.src  = 'graphics/forward0.gif';
  forward1 = new Image();
  forward1.src = 'graphics/forward1.gif';
  
  back0 = new Image();
  back0.src  = 'graphics/back0.gif';
  back1 = new Image();
  back1.src = 'graphics/back1.gif';
}

function change(Name,Image,No) {
	 if (!document.images) {}
     else document.images[Name].src = eval(Image + No + '.src');
}