function loader_open (zid,centering) {

    var zid;
    var centering;

    if (centering == true) {
        cen = true;
    } else {
        cen = false;
    }

    if (zid == null) {
       $.blockUI.defaults.css = {};
        $.blockUI({
          message: '<div style="text-align:center"><input type="hidden" id="loader_status" value="loading"><img src="/images/loaders/loader.gif" alt="#Loading"></div>',
          centerY: false,
          css: {
            top: '100px'
          }
        });
    } else {
       $.blockUI.defaults.css = {};
        $(zid).block({
           message: '<div style="text-align:center"><input type="hidden" id="loader_status" value="loading"><img src="/images/loaders/loader.gif" alt="#Loading"></div>',
           centerY: cen,
           css: {
                  top: '50px'
           }
        });
    }

   setTimeout (
        function () {
            loader_check(zid);
        },
        15000
   )

}




function loader_close(zid) {
   var zid;
   if (zid == null) {
        $.unblockUI();
   } else {
        $(zid).unblock();
   }

}

function loader_check(zid) {
  var zid;
  if ($('#loader_status').val() == 'loading') {
    loader_close(zid)
  }
}



function loader_content(zhtml) {
  $('#blockUI_content').html(zhtml);
}