function Hide(obj)
{
    obj.style.display = 'none';
}

function Show(obj)
{
    obj.style.display = '';
}

function HideAndEnable(obj)
{
	obj.style.display = 'none';
	document.getElementById("submit").disabled = false;
}

function ShowAndDisable(obj)
{
	obj.style.display = '';
	document.getElementById("submit").disabled = true;
}

function ShowColor(div, pnl)
{
	div.style.display = '';
	pnl.style.backgroundColor='lightcoral'
}
function HideColor(div, pnl)
{
	div.style.display = 'none';
	pnl.style.backgroundColor='lightblue'
}
function ColorBlue(obj)
{
	obj.style.backgroundColor = 'lightblue'
}
function ColorRed(obj)
{
	obj.style.backgroundColor = 'lightcoral'
}

function ChangeCheckBoxState(id, checkState)
        {
            var cb = document.getElementById(id);
            if (cb != null)
               cb.checked = checkState;
        }
        
        function ChangeAllCheckBoxStates(checkState)
        {
            // Toggles through all of the checkboxes defined in the CheckBoxIDs array
            // and updates their value to the checkState input parameter
            if (CheckBoxIDs != null)
            {
                for (var i = 0; i < CheckBoxIDs.length; i++)
                   ChangeCheckBoxState(CheckBoxIDs[i], checkState);
            }
        }
        
        function ChangeHeaderAsNeeded()
        {
            // Whenever a checkbox in the GridView is toggled, we need to
            // check the Header checkbox if ALL of the GridView checkboxes are
            // checked, and uncheck it otherwise
            if (CheckBoxIDs != null)
            {
                // check to see if all other checkboxes are checked
                for (var i = 1; i < CheckBoxIDs.length; i++)
                {
                    var cb = document.getElementById(CheckBoxIDs[i]);
                    if (!cb.checked)
                    {
                        // Whoops, there is an unchecked checkbox, make sure
                        // that the header checkbox is unchecked
                        ChangeCheckBoxState(CheckBoxIDs[0], false);
                        return;
                    }
                }
                
                // If we reach here, ALL GridView checkboxes are checked
                ChangeCheckBoxState(CheckBoxIDs[0], true);
            }
        }