window.onload = function()
{
   var spread = 
   new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
   var activeSheet = spread.getActiveSheet();
   var sheet1 = spread.getSheet(0),
   sheet2 = spread.getSheet(1);
   sheet1.name("Sheet1");
   sheet2.name("Sheet2");
        
   sheet1.setValue(0, 0, 1000);
   sheet1.setValue(1, 0, 2000);
   sheet1.setValue(2, 0, 3000);
   sheet1.setValue(3, 0, 4000);
   sheet1.getRange(0, 0, 4, 1).backColor("lightPink");
   sheet2.setValue(0, 0, 5000);
   sheet2.getRange(0, 0, 1, 1).backColor("lightCyan");

   // Set a sum formula of "Sheet1: total of cell(0,0) to cell(3,0)" and "Sheet2: cell(0,0)".
   sheet2.setFormula(1, 1, "SUM(Sheet1!A1:A4) + Sheet2!A1");
   sheet2.getRange(1, 1, 1, 1).backColor("lemonChiffon");
}