function control_login(id){
	var f = document.getElementById(id)
	error_login("Comprobando...","error_"+id);
	with(f){
		if(user.value == "") return(error_login(' Introduzca usuario ',"error_"+id));
		if(pass.value == "") return(error_login(' Introduzca password',"error_"+id));				

	}
	return(true);
}

function procesa_login_top(id){
	var id = "formulario_top";
	if(control_login(id)){
		var f = document.getElementById(id);
		f.submit();

	}

}

function procesa_login(){
	var id = "formulario";
	return(control_login(id));
}



function error_login(msg,id){
	if(id){
		var f = document.getElementById(id);		
		f.innerHTML = msg;
	}else{
		try{
			var f = document.getElementById("error_formulario_top");f.innerHTML = msg;			
			var f = document.getElementById("error_formulario");f.innerHTML = msg;			
		}catch(e){};
	}
	return(false);
}