window.addEvent('domready',function(){
    
    });

function ajx_loading(el) {
    if ($('ajx_loading')) {
        return;
    }
    var target = el.getParent();
    var loading = new Element('div', {
        'id' : 'ajx_loading'
    });
    loading.set('opacity', 0.50);
    loading.inject(target, 'top');
}

function remove_ajx_loading() {
    if (!$('ajx_loading')) {
        return;
    }
    $('ajx_loading').destroy();
}