var imageDir = "/index_images/";
var loadFlag = null;

function preLoad () {
loadList = new Array("button1_over.gif","button2_over.gif","button3_over.gif","button4_over.gif","button5_over.gif","button6_over.gif","button_link_over.gif");
loadImages = new Array ();
for (i in loadList) {
loadImages[i] = new Image();
loadImages[i].src = imageDir + loadList[i];
}
loadFlag = 1;
}

function changeImage(arg1,arg2) {
if (loadFlag && arg1 && arg2) {
document.images[arg1].src = imageDir + arg2;
}
}