function checkedAll (checkbox,formname)
{
    var somediv = document.getElementById(checkbox);
    var aa= document.getElementById(formname);
    var checked = (somediv.checked);
    for (var i =0; i < aa.elements.length; i++)
    {
        if (aa.elements[i].value==checkbox)
        {
            aa.elements[i].checked = checked;
        }
    }
}