function swap(targetId, id){
	if (document.getElementById){
		target = document.getElementById(targetId);
        if (target.style.display == "none"){
			target.style.display = "block";
        } 
        else{
            target.style.display = "none";
        }        
    }
	element = document.getElementById(id);
	if(element.className == 'ninguna'){
		element.className = 'boldPregunta';
	}
	else{
		element.className = 'ninguna';
	}
}