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) {
		btn01_over = newImage("images/btn01-over.gif");
		btn02_btn01_over = newImage("images/btn02-btn01_over.gif");
		btn03_btn01_over = newImage("images/btn03-btn01_over.gif");
		btn04_btn01_over = newImage("images/btn04-btn01_over.gif");
		btn05_btn01_over = newImage("images/btn05-btn01_over.gif");
		btn06_btn01_over = newImage("images/btn06-btn01_over.gif");
		btn07_btn01_over = newImage("images/btn07-btn01_over.gif");
		btn08_btn01_over = newImage("images/btn08-btn01_over.gif");
		btn09_btn01_over = newImage("images/btn09-btn01_over.gif");
		btn10_btn01_over = newImage("images/btn10-btn01_over.gif");
		btn11_btn01_over = newImage("images/btn11-btn01_over.gif");
		btn12_btn01_over = newImage("images/btn12-btn01_over.gif");
		btn13_btn01_over = newImage("images/btn13-btn01_over.gif");
		btn14_btn01_over = newImage("images/btn14-btn01_over.gif");
		btn15_btn01_over = newImage("images/btn15-btn01_over.gif");
		btn16_btn01_over = newImage("images/btn16-btn01_over.gif");
		btn17_btn01_over = newImage("images/btn17-btn01_over.gif");
		btn18_btn01_over = newImage("images/btn18-btn01_over.gif");
		btn19_btn01_over = newImage("images/btn19-btn01_over.gif");
		btn20_btn01_over = newImage("images/btn20-btn01_over.gif");

		preloadFlag = true;
	}
}