function abrirVentana(URL,ventana,height,width,extras){
var myLeft = (screen.width - width)/2;
var myTop  = (screen.height - height)/2;
window.open(URL,ventana,extras+"height="+height+",width="+width+",top="+myTop+",left="+myLeft);
return false;
}


function validarFormulario(formu){
	if (formu.correo.value == ""){
		alert("Debe introducir una correo electronico");
		formu.correo.focus()
		return false;
	}

	if (formu.password.value == ""){
		alert("Debe introducir una correo password");
		formu.password.focus();
		return false;
	}
	
	if (formu.correo.value.indexOf('@') == -1 || formu.correo.value.indexOf('.') == -1){
		alert("Debe escribir un correo valido. \n ejemplo juan@hotmail.es");
		formu.correo.focus();
		return false;
	}

	if (formu.id.value == "index"){
		var myLeft = (screen.width-400)/2;
		var myTop = (screen.height-400)/2;
		window.open('','tiempoRestante','height=400,width=400,left='+myLeft+',top='+myTop);
	}
	formu.submit();
	
}