function SelectCheckBox(i, checkBoxName)
{
    var id = checkBoxName + "_" + (i-1);
    var el =  document.getElementById(id);
    el.checked = false;
}

function DeSelectCheckBox(i, checkBoxName)
{
    var id = checkBoxName + "_" + (i-1);
    
    for (var x = 0; x < (i-1); x++)
    {
        var id = checkBoxName + "_" + (x);
        var el =  document.getElementById(id);
        el.checked = false;
    } 
}