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) {
		home_over = newImage("images/home_gs-over.jpg");
		about_over = newImage("images/about_gs_over.jpg");
		careers_over = newImage("images/careers_gs_over.jpg");
		employers_over = newImage("images/employers_gs_over.jpg");
		links_over = newImage("images/links.jpg");
		newsltr_over = newImage("images/newsltr_gs_over.jpg");
		bookshelf_over = newImage("images/bookshelf_gs_over.jpg");		
		sendemail_over = newImage("images/sendemail_over.jpg");
		home_text = newImage("images/home_text.jpg");
		about_text = newImage("images/about_text.jpg");
		careers_text = newImage("images/careers_text.jpg");
		employers_text = newImage("images/employers_text.jpg");
		links_text = newImage("images/notext.jpg");
		newsltr_text = newImage("images/newsltr_text.jpg");
		bookshelf_text = newImage("images/bookshelf_text.jpg");		
		sendemail_text = newImage("images/sendemail_text.jpg");
		preloadFlag = true;
	}
}
preloadImages();