var win = null;
function CenterWindow(mypage,myname,w,h,scroll){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings ='height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
	win = window.open(mypage,myname,settings)
}

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) {
		btn_index_over = newImage("images/btn_index-over.gif");
		btn_index_down = newImage("images/btn_index-down.gif");
		btn_goods_over = newImage("images/btn_goods-over.gif");
		btn_goods_down = newImage("images/btn_goods-down.gif");
		btn_basket_over = newImage("images/btn_basket-over.gif");
		btn_basket_down = newImage("images/btn_basket-down.gif");
		btn_profile_over = newImage("images/btn_profile-over.gif");
		btn_profile_down = newImage("images/btn_profile-down.gif");
		preloadFlag = true;
	}
}