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) {
		nav_designers_over = newImage("images/nav_designers-over.jpg");
		nav_calendar_over = newImage("images/nav_calendar-over.jpg");
		nav_contact_over = newImage("images/nav_contact-over.jpg");
		
		
		btn_login_over = newImage("images/btn_login-over.jpg");
		btn_request_over = newImage("images/btn_request-over.jpg");
		btn_questions_over = newImage("images/btn_questions-over.jpg");
		
		
		preloadFlag = true;
	}
}