var popupWindow = null

function OpenPopupWindow(URL, windowFeatures)
{
    popupWindow = window.open(URL,"PopupWindow",windowFeatures);
}

function ClosePopupWindow()
{
    if (popupWindow != null)
    {
	if (!popupWindow.closed)
	{
	    popupWindow.close()
	}
    }
}

function DisplayCloseButton()
{
    if (window.opener != null)
    {
        document.write('<form method="POST"><center><p><input type="button" name="CloseButton" value="Close" onclick="self.close()"></p></center></form>')
    }
}