function openTab($id_tab){
    $('.AccordionPanel').removeClass('AccordionPanelOpen');
    $('.AccordionPanel').addClass('AccordionPanelClosed');
    $('.AccordionPanelContent').hide();


    $($id_tab).removeClass('AccordionPanelClosed');
    $($id_tab).addClass('AccordionPanelOpen');
    $($id_tab).children('.AccordionPanelContent').show();
     $($id_tab).children('.AccordionPanelContent').css('height','auto');
}