$(document).ready(function ()
{
    // Set the number of sheets to 3.
    var spread =
    new GC.Spread.Sheets.Workbook(document.getElementById("ss"),
    {sheetCount:3});

   $("#button1").click(function()
   {
     // Create a new sheet and add it at 2nd position.
     var sheet = new GC.Spread.Sheets.Worksheet();
     sheet.name("The added sheet");
     spread.addSheet(1, sheet);
   });
});