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_sales_over = newImage('images/sales_over.gif');
		pre_rides_over = newImage('images/rides_over.gif');
		pre_contact_over = newImage('images/contact_over.gif');
		pre_rentals_over = newImage('images/rentals_over.gif');
		pre_service_over = newImage('images/service_over.gif');
		preloadFlag = true;
	}
}

var now = new Date();
this_year = fourdigits(now.getYear());

function fourdigits(number)	{
	return (number < 1000) ? number + 1900 : number;
 }