function openwin(mypage,w,h){
myname="";
LeftPosition = parseInt((screen.width) ? (screen.width-w)/2  : 0);
TopPosition = parseInt((screen.height) ? (screen.height-h)/2  : 0);
settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars=no';
var wina = window.open(mypage,myname,settings);
}

function message(txt)  {
alert (txt);
}

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) {
		home2010_15_over = newImage("images/home2010_15-over.jpg");
		home2010_17_over = newImage("images/home2010_17-over.jpg");
		home2010_20_over = newImage("images/home2010_20-over.jpg");
		preloadFlag = true;
	}
}