//cache images 
linkimage1 = new Image();   linkimage1.src = "i/cottage1.jpg";
linkimage2 = new Image();   linkimage2.src = "i/cottage2.jpg";
linkimage3 = new Image();   linkimage3.src = "i/cottage3.jpg";
linkimage4 = new Image();   linkimage4.src = "i/cottage4.jpg";
linkimage5 = new Image();   linkimage5.src = "i/cottage5.jpg";
linkimage6 = new Image();   linkimage6.src = "i/cottage6.jpg";
linkimage7 = new Image();   linkimage7.src = "i/cottage7.jpg";

//change to active image
function go_active(imageName){
    document.images.changeImage.src='i/' + imageName + '.jpg';
}

//change to default image (normal)
function go_default(imageName){
    document.images.changeImage.src='i/default1.jpg';
}