function CheckAllDataGridCheckBoxes(aspCheckBoxID,checkVal)
{
    var len=document.getElementsByTagName("input").length;
    
    for(i = 0; i < len; i++)
    {
        if (document.getElementsByTagName("input")[i].type == 'checkbox')
        {
            document.getElementsByTagName("input")[i].checked=checkVal.checked
        }
    }
}