var btn_info = new Image();
btn_info.src = "images/btn_info.gif";

var btn_info_hot = new Image();
btn_info_hot.src = "images/btn_info_hot.gif";

var btn_photos = new Image();
btn_photos.src = "images/btn_photos.gif";

var btn_photos_hot = new Image();
btn_photos_hot.src = "images/btn_photos_hot.gif";

var btn_guestbook = new Image();
btn_guestbook.src = "images/btn_guestbook.gif";

var btn_guestbook_hot = new Image();
btn_guestbook_hot.src = "images/btn_guestbook_hot.gif";
      
      

function rollOver(imgName) {  
  if(document.images[imgName]) {
    document[imgName].src = eval(imgName + "_hot.src")
  }  
}

function rollOut(imgName) {  
  if(document.images[imgName]) {
    document[imgName].src = eval(imgName + ".src");
  }  
}