<!--
function loadimages() {
       img_0 = new Image(); 
       img_0.src = "images/bt01on.gif";
       img_1 = new Image(); 
       img_1.src = "images/bt02on.gif";
       img_2 = new Image(); 
       img_2.src = "images/bt03on.gif";
       img_3 = new Image(); 
       img_3.src = "images/bt04on.gif";
       img_4 = new Image(); 
       img_4.src = "images/bt05on.gif";
       img_5 = new Image(); 
       img_5.src = "images/bt06on.gif";
}
function imgchange(img_name,img_src) {
         document[img_name].src=img_src;
}
// -->