jquery – How to call ajax only once

I call function from this code :

    <div id=\"header-button-news\" class=\"header-button-info\">
        <a href=\"javascript:;\" title=\"Новости\" onclick=\"showNews()\"></a>
        <div class=\"new\">2</div>
    </div>

My function is

function showNews()
{          
        //other js which show block 

        jQuery(\"#loader\").show();


        //ajax which load content to block
        jQuery.ajax({
            type: \"GET\",
            url: link,
            dataType: \"html\",
            success: function(data) {
                jQuery(\'#top-info-news\').html(data);   
            },
            complete: function(){
                jQuery(\'#loader\').hide();
            },
        });
}

How can I make only once ajax call? so when content is loaded and page was not refresed not to load ajax? I tried to do boolean variables but nothing, I suppouse it is because I call everytime function. Please give me an idea how to do.

thank you

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