function newImage(arg) {
if (document.images) {
rslt = new Image();
rslt.src = arg;
return rslt;
}
}

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

var preloadFlag = false;
function preloadImages() {
if (document.images) {

button_head_01_over = newImage("../images/button_head_01_2.gif");
button_head_02_over = newImage("../images/button_head_02_2.gif");
button_head_03_over = newImage("../images/button_head_03_2.gif");
button_head_04_over = newImage("../images/button_head_04_2.gif");
button_head_05_over = newImage("../images/button_head_05_2.gif");
button_head_06_over = newImage("../images/button_head_06_2.gif");

button_navi_01_over = newImage("../images/button_navi_01_2.gif");
button_navi_02_over = newImage("../images/button_navi_02_2.gif");
button_navi_03_over = newImage("../images/button_navi_03_2.gif");
button_navi_04_over = newImage("../images/button_navi_04_2.gif");
button_navi_05_over = newImage("../images/button_navi_05_2.gif");
button_navi_06_over = newImage("../images/button_navi_06_2.gif");
button_navi_07_over = newImage("../images/button_navi_07_2.gif");

button_topics_01_over = newImage("../images/button_topics_01_2.gif");

button_foot_01_over = newImage("../images/button_foot_01_2.gif");


preloadFlag = true;
}
}
preloadImages();