if (document.images) {
  image15on = new Image();
  image15on.src = "navbtns/bt_x_floorplans_on.gif";
  
  image16on = new Image();
  image16on.src = "navbtns/bt_x_exterior_on.gif";
  
  image17on = new Image();
  image17on.src = "navbtns/bt_x_top_on.gif";
  
  image18on = new Image();
  image18on.src = "navbtns/bt_x_floorplans_on.gif";
      
  image19on = new Image();
  image19on.src = "navbtns/bt_x_exterior_on.gif";
      
  image20on = new Image();
  image20on.src = "navbtns/bt_x_top_on.gif";
  
  image21on = new Image();
  image21on.src = "navbtns/bt_x_floorplans_on.gif";
      
  image22on = new Image();
  image22on.src = "navbtns/bt_x_exterior_on.gif";
      
  image23on = new Image();
  image23on.src = "navbtns/bt_x_top_on.gif";
  
  image24on = new Image();
  image24on.src = "navbtns/bt_x_floorplans_on.gif";
      
  image25on = new Image();
  image25on.src = "navbtns/bt_x_exterior_on.gif";
      
  image26on = new Image();
  image26on.src = "navbtns/bt_x_top_on.gif";
  
  image15off = new Image();
  image15off.src = "navbtns/bt_x_floorplans_off.gif";
  
  image16off = new Image();
  image16off.src = "navbtns/bt_x_exterior_off.gif";
  
  image17off = new Image();
  image17off.src = "navbtns/bt_x_top_off.gif";

  image18off = new Image();
  image18off.src = "navbtns/bt_x_floorplans_off.gif";
      
  image19off = new Image();
  image19off.src = "navbtns/bt_x_exterior_off.gif";
      
  image20off = new Image();
  image20off.src = "navbtns/bt_x_top_off.gif";
  
  image21off = new Image();
  image21off.src = "navbtns/bt_x_floorplans_off.gif";
      
  image22off = new Image();
  image22off.src = "navbtns/bt_x_exterior_off.gif";
      
  image23off = new Image();
  image23off.src = "navbtns/bt_x_top_off.gif";
  
  image24off = new Image();
  image24off.src = "navbtns/bt_x_floorplans_off.gif";
      
  image25off = new Image();
  image25off.src = "navbtns/bt_x_exterior_off.gif";
      
  image26off = new Image();
  image26off.src = "navbtns/bt_x_top_off.gif";
    
}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}