window.onload = function(){
       var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
       var activeSheet = spread.getActiveSheet();

//Set the backcolor and forecolor of a cell.
var cell = activeSheet.getCell(1, 1, GC.Spread.Sheets.SheetArea.viewport);
cell.backColor("Blue");
cell.foreColor("Red");
cell.value("Color");
                      }