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) {
		btnRestrita_over = newImage("images/btnRestrita-over.gif");
		btnFale_over = newImage("images/btnFale-over.gif");
		btnHome_over = newImage("images/btnHome-over.gif");
		btnMensagem_over = newImage("images/btnMensagem-over.gif");
		btnComissoes_over = newImage("images/btnComissoes-over.gif");
		btnInscricoes_over = newImage("images/btnInscricoes-over.gif");
		btnTrabalhos_over = newImage("images/btnTrabalhos-over.gif");
		btnPrograma_over = newImage("images/btnPrograma-over.gif");
		btnPalestrantes_over = newImage("images/btnPalestrantes-over.gif");
		btnCurso_over = newImage("images/btnCurso-over.gif");
		btnSocial_over = newImage("images/btnSocial-over.gif");
		btnLocal_over = newImage("images/btnLocal-over.gif");
		btnAgencia_over = newImage("images/btnAgencia-over.gif");
		btnExpo_over = newImage("images/btnExpo-over.gif");
		btnReserva_over = newImage("images/btnReserva-over.gif");
		preloadFlag = true;
	}
}