function send_ajax_request(url)
{
    jQuery("#ajax-loader").show();
    
    jQuery.ajax({
        url: url,
        type: 'post',
        success: function(data)
        {
            json = eval('(' + data + ')');

            jQuery('#colMain').html(json.html);
            jQuery("#ajax-loader").hide();
        },
        error: function(response) {
            jQuery("#ajax-loader").hide();
            alert('error');
        }
    });
}