var preloadFlag = false;
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];
		}
	}
}
function preloadImages() {
	if (document.images) {
		over_01 = newImage('picture/topbutton1on.jpg');
		over_02 = newImage('picture/topbutton1.jpg');
		over_03 = newImage('picture/topbutton2on.jpg');
		over_04 = newImage('picture/topbutton2.jpg');
		over_05 = newImage('picture/topbutton3on.jpg');
		over_06 = newImage('picture/topbutton3.jpg');
		over_07 = newImage('picture/topbutton4on.gif');
		over_08 = newImage('picture/topbutton4.gif');
		over_09 = newImage('picture/topbutton5on.gif');
		over_10 = newImage('picture/topbutton5.gif');
		over_11 = newImage('picture/topbutton6on.gif');
		over_12 = newImage('picture/topbutton6.gif');
		over_13 = newImage('picture/topbutton7on.gif');
		over_14 = newImage('picture/topbutton7.gif');
		preloadFlag = true;
	}
}