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

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

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

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

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

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

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_images = new Image();
btn_images.src = "images/btn_images.gif";

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

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

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

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

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

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

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

var btn_searchbus_hot = new Image();
btn_searchbus_hot.src = "images/btn_searchbus_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");
  }  
}