function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
function changeImagesArray(array) {
	if (preloadFlag == true) {
		var d = document; var img;
		for (var i=0; i<array.length; i+=2) {
			img = null; var n = array[i];
			if (d.images) {img = d.images[n];}
			if (!img && d.getElementById) {img = d.getElementById(n);}
			if (img) {img.src = array[i+1];}
		}
	}
}
function changeImages() {
	changeImagesArray(changeImages.arguments);
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_btn_home_over = newImage('images/btn-home-over.gif');
		pre_btn_about_over = newImage('images/btn-about-over.gif');
		pre_btn_client_over = newImage('images/btn-client-over.gif');
		pre_btn_group_over = newImage('images/btn-group-over.gif');
		pre_btn_news_over = newImage('images/btn-news-over.gif');
		pre_btn_conttact_over = newImage('images/btn-conttact-over.gif');
		btn_request_over = newImage("images/btn-request-over.jpg");
		preloadFlag = true;
	}
}