function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImagesArray(array) {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<array.length; i+=2) {
			document[array[i]].src = array[i+1];
		}
	}
}

function changeImages() {
	changeImagesArray(changeImages.arguments);
}

function toggleImages() {
	for (var i=0; i<toggleImages.arguments.length; i+=2) {
		if (selected == toggleImages.arguments[i])      changeImagesArray(toggleImages.arguments[i+1]);
	}
}

var selected = '';
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		n_home_over = newImage("images/n-home_over.jpg");
		n_about_over = newImage("images/n-about_over.jpg");
		n_boards_over = newImage("images/n-boards_over.jpg");
		n_access_over = newImage("images/n-access_over.jpg");
		n_clothing_over = newImage("images/n-clothing_over.jpg");
		n_contact_over = newImage("images/n-contact_over.jpg");
		n_about_overboardssel = newImage("images/n-about_overboardssel.jpg");
		n_about_overaccesssel = newImage("images/n-about_overaccesssel.jpg");
		n_about_overclothingsel = newImage("images/n-about_overclothingsel.jpg");
		n_about_overcontactsel = newImage("images/n-about_overcontactsel.jpg");
		n_home_overaboutsel = newImage("images/n-home_overaboutsel.jpg");
		n_boards_overaccesssel = newImage("images/n-boards_overaccesssel.jpg");
		n_boards_overclothingsel = newImage("images/n-boards_overclothingsel.jpg");
		n_boards_overcontactsel = newImage("images/n-boards_overcontactsel.jpg");
		n_home_overboardssel = newImage("images/n-home_overboardssel.jpg");
		n_access_overclothingsel = newImage("images/n-access_overclothingsel.jpg");
		n_access_overcontactsel = newImage("images/n-access_overcontactsel.jpg");
		n_home_overaccesssel = newImage("images/n-home_overaccesssel.jpg");
		n_clothing_overcontactsel = newImage("images/n-clothing_overcontactsel.jpg");
		n_home_overclothingsel = newImage("images/n-home_overclothingsel.jpg");
		n_home_overcontactsel = newImage("images/n-home_overcontactsel.jpg");
		preloadFlag = true;
	}
}