function check_form(){
	var name = $('#name').val();
	var mail = $('#mail').val();
	var tel = $('#tel').val();
	var text_msg = $('#msg').val();
	var msg = $('#msg_error');
	
	if(name != '' && mail != '' && tel != '' && text_msg != ''){
		
		msg.innerHTML = '';
		var dataString = $('#form_contact').serialize();
		$.ajax({
			type: "POST",
			url: "send_contact.php",
			data: dataString,
			success: function(data) {
				msg.html(data);
				document.getElementById('form_contact').reset();
			}
		});
	}else{
		msg.html('Todos los campos son requeridos.');
	}
	return false;
}