How to convert html table to excel with multiple sheet?

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How to convert multiple html table to excel sheet with multiple worksheet ? Could you please help into this.

Advance Thanks...

        function tablesToExcel() {
        {

            var tab_text = "<table border='2px'><tr bgcolor='#87AFC6'>";
            var textRange; var j = 0;
            tab = document.getElementById('tbl2'); // id of table


            for (j = 0 ; j < tab.rows.length ; j++) {
                tab_text = tab_text + tab.rows[j].innerHTML + "</tr>";
                //tab_text=tab_text+"</tr>";
            }

            tab_text = tab_text + "</table>";
            var ua = window.navigator.userAgent;
            var msie = ua.indexOf("MSIE ");

            if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./))      // If Internet Explorer
            {
                txtArea1.document.open("txt/html", "replace");
                txtArea1.document.write(tab_text);
                txtArea1.document.close();
                txtArea1.focus();
                sa = txtArea1.document.execCommand("SaveAs", true, "Say Thanks to Sumit.xls");
            }
            else                 //other browser not tested on IE 11
                sa = window.open('data:application/vnd.ms-excel,' + encodeURIComponent(tab_text));


            return (sa);
        }

 }