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) {
		button1_text = newImage("images/button1_text.png");
		button2_text = newImage("images/button2_text.png");
		button3_text = newImage("images/button3_text.png");
		button4_text = newImage("images/button4_text.png");
		button5_text = newImage("images/button5_text.png");
		button6_text = newImage("images/button6_text.png");
		button7_text = newImage("images/button7_text.png");
		button8_text = newImage("images/button8_text.png");
		preloadFlag = true;
	}
}