function ChangeImage(strName, strSource) {
	document.images[strName].src = strSource;
}

function PreloadImages() {
	var intSrc, strSrc;
	var arrSrc = PreloadImages.arguments;
	for (intSrc = 0; intSrc < arrSrc.length; intSrc++) {
		strSrc = arrSrc[intSrc];
		arrSrc[intSrc] = new Image();
		arrSrc[intSrc].src = strSrc;
	}
}

function NewWindow(strPage, strName, intWidth, intHeight) {
	var intLeft = (screen.width - intWidth) / 2;
	var intTop = ((screen.height - intHeight) / 2) - 50;
	var strProperties = 'height=' + intHeight + ',width=' + intWidth + ',top=' + intTop + ',left=' + intLeft + ',status=yes,scrollbars=yes,resizable=yes';
	window.open(strPage, strName, strProperties);
}