function newImage( imgSrc ){

 var imgName = new Image();
 imgName.src = imgSrc;

 return imgName;

}

function change( imgName, imgLocation )
{
 document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
 green_saving_over = newImage("green-saving-over.gif");
 about_contact_over = newImage("about-contact-over.gif");
 heating_water_over = newImage("heating-water-over.gif");
 kitchen_over = newImage("kitchen-over.gif");
 around_house_over = newImage("around-house-over.gif");
 driving_transport_over = newImage("driving-transport-over.gif");
 office_over = newImage("office-over.gif");
 shop_over = newImage("shop-over.gif");
 change_supplier_over = newImage("change-supplier-over.gif");
 links_over = newImage("links-over.gif");

 preloadFlag = true;
 }
}