function mostrarocultarmenu(targetId){
	 if (document.getElementById){
		 target = document.getElementById(targetId);
		 if (target.style.display == ""){
		 	target.style.display = "none";
		 }
		 else {
		 	target.style.display = "";
		 }
	 }
}
function abrir_ejercicio(){
    window.open('http://www.inlingua.com/quiz/quiz.asp','','width=600,height=500');
}