function $(id) {return document.getElementById(id);}
/*----------------------------------------------------------------------*/
function chkFormLogin(){
	var email  = $('lg_email');
	var pass = $('lg_password');
	
	if (email.value == ''){alert('Complete el email'); email.focus(); return false;}
	if (pass.value == '') {alert('Complete la contrase\u00F1a'); pass.focus(); return false;}
	
	return true;
}
/*----------------------------------------------------------------------*/
function getFileExtension(filename){
	var file_ext = '';
	var pospunto = filename.lastIndexOf(".");

	if(pospunto != -1){
		file_ext = filename.substr(pospunto, filename.length); 
	}
	return file_ext.toLowerCase(); 
}

/* Mostrar y ocultar div para facebook*/
function showFacebookDiv()  {jQuery("#contenedor_facebook").show('slow')}
function cerrarFacebookDiv(){jQuery("#contenedor_facebook").fadeOut('slow');}