$(this.a).contents().unwrap();

var tableToExcel = (function() {
  var uri = 'data:application/vnd.ms-excel;base64,'
    , template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>'
    , base64 = function(s) { return window.btoa(unescape(encodeURIComponent(s))); }
    , format = function(s, c) { return s.replace(/{(\w+)}/g, function(m, p) { return c[p]; }); };
  return function(table, name) {
    if (!table.nodeType) table = document.getElementById(table);
    var ctx = {worksheet: name || 'Worksheet', table: table.innerHTML};
    window.location.href = uri + base64(format(template, ctx));
  };
})();