var imageDir = "img/";
var loadList;
var action = "off";
function preLoad() {
loadList = new Array("navi_30splanning_on.gif","navi_30scounseling_on.gif","navi_30sjob_on.gif");
onImages = new Array();
for (field in loadList)
{
onImages[field] = new Image();
onImages[field].src = imageDir + loadList[field];
}
action = "on";
}
function changeImage(fileName, imageName) 
{
if (action == "on") {
document.images[imageName].src = imageDir + fileName;
}
}