(function($){
    var ajax_calls = [];
    
    $.add_ajax_call = function(ajax_object){        
        ajax_calls.push(ajax_object);        
    } 
    
    $.clear_ajax_calls = function(callback){        
        var ajax_call = null;
        while(ajax_call = ajax_calls.pop())
            ajax_call.abort();
        
        if(callback)    
            callback();
    }


})(jQuery)