var m_oPopUpWnd = null;		
function open_pop_up(nHeight, nWidth, bCentered, szURL)
	{
	var n_w = 0, n_h = 0; 
	var n_x = 0, n_y = 0;

	n_w = nWidth, n_h = nHeight; 
	n_x = ((window.screen.availWidth) - n_w) / 2; 
	n_y = ((window.screen.availHeight) - n_h) / 2;
	
	if(m_oPopUpWnd)
		if(!(m_oPopUpWnd.closed))
			m_oPopUpWnd.close();
	m_oPopUpWnd = null;		
	
	if(bCentered)
		m_oPopUpWnd = window.open(szURL, "ccard_open_pop_up", "left=" + n_x + ",top=" + n_y + ",resizable=yes,scrollbars=yes,menubar=no,location=no,toolbar=no,status=yes,width=" + n_w + ",height=" + n_h + "\"");		
	else
		m_oPopUpWnd = window.open(szURL, "ccard_open_pop_up", "resizable=yes,scrollbars=no,menubar=no,location=no,toolbar=no,status=no,width=" + n_w + ",height=" + n_h + "\"");
	m_oPopUpWnd.focus();		
	}