Normal1 = new Image();
Normal1.src = "interfaces/04_home.gif";
Highlight1 = new Image();
Highlight1.src = "interfaces/04_home_hi.gif";

Normal2 = new Image();
Normal2.src = "interfaces/07_solar_power.gif";
Highlight2 = new Image();
Highlight2.src = "interfaces/07_solar_power_hi.gif"; 

Normal3 = new Image();
Normal3.src = "interfaces/08_co_generation.gif";  
Highlight3 = new Image();
Highlight3.src = "interfaces/08_co_generation_hi.gif";

Normal4 = new Image();
Normal4.src = "interfaces/09_useful_resources.gif";
Highlight4 = new Image();
Highlight4.src = "interfaces/09_useful_resources_hi.gif";

Normal5 = new Image();
Normal5.src = "interfaces/10_about_us.gif";
Highlight5 = new Image();
Highlight5.src = "interfaces/10_about_us_hi.gif"; 

Normal6 = new Image();
Normal6.src = "interfaces/11_contact.gif";
Highlight6 = new Image();
Highlight6.src = "interfaces/11_contact_hi.gif";


function Imageswap (Imagenr, Imageobject) {
  window.document.images[Imagenr].src = Imageobject.src;
}