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<sc ript type="text/javascript">
    BX.addCustomEvent('onAjaxSuccess', function(){
        
    if (typeof $ === 'undefined') {
        alert('now adding jquery');
        var head = document.getElementsByTagName("head")[0];
        script = document.createElement('script');
        script.type = 'text/javascript';
        script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js';
        head.appendChild(script);
        if (typeof jQuery === 'undefined') {
            alert('jquery still not present :(');
        }
    } else {
        alert('jquery already present');
    }        
    });
</sc ript>

BX.addCustomEvent('onAjaxSuccess', function () {
    jQuery(function () {

      jQuery('.ololo').text('ololo')

    })
});