function trocaAbas( idClicado, classeOpcoes, idDiv, classeDiv ) {
	var allElements = document.getElementsByTagName('*');
	
	for (var i=0; i<allElements.length; i++){
		if (allElements[i].className.indexOf(classeOpcoes) > -1){
			allElements[i].className = allElements[i].className.replace(' selecionado','');			
		}
	}
	
	document.getElementById(idClicado).className += ' selecionado';
	
	for (var i=0; i<allElements.length; i++){
		if (allElements[i].className.indexOf(classeDiv) > -1){
			allElements[i].style.display = 'none';
		}
	}
	
	document.getElementById(idDiv).style.display = 'block';
}