inserts new task with specified id, name, start date, duration, percent completed, predecessor task Id, parent task Id and returns it
var task120 = ganttChart.insertTask(120, "Development", new Date(2010,0,29), 80, 5, "",""); // create new child task. var task121 = ganttChart.insertTask(121, "Development: C#", new Date(2010,0,29), 16, 23, "", 120); // create new dependent task. var task130 = ganttChart.insertTask(130, "After development - testing", new Date(2010,1,9), 24, 0, 120, "");