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) {
			//alert(eval(changeImages.arguments[i+1]).src);
			document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1]).src;
		}
	}
}

var preloadFlag = false;

	if (document.images) {
		button1 = newImage("imgs/nav01.jpg");
		button2 = newImage("imgs/nav02.jpg");
		button3 = newImage("imgs/nav03.jpg");
		button4 = newImage("imgs/nav04.jpg");
		button5 = newImage("imgs/nav05.jpg");
		button6 = newImage("imgs/nav06.jpg");
		button7 = newImage("imgs/nav07.jpg");
		button8 = newImage("imgs/nav08.jpg");
        button1_over = newImage("imgs/nav01_over.jpg");
		button2_over = newImage("imgs/nav02_over.jpg");
		button3_over = newImage("imgs/nav03_over.jpg");
		button4_over = newImage("imgs/nav04_over.jpg");
		button5_over = newImage("imgs/nav05_over.jpg");
		button6_over = newImage("imgs/nav06_over.jpg");
		button7_over = newImage("imgs/nav07_over.jpg");
		button8_over = newImage("imgs/nav08_over.jpg");
		preloadFlag = true;
	}