var oPopupWindow = null;
function Popup(sUrl, sWindowName, nWidth, nHeight, bStatus, bToolbar, bMenubar, bScrollbars, bResizable)
{
	/*
	if (bStatus 	== null) { bStatus 		= 1; }
	if (bToolbar 	== null) { bToolbar 	= 0; }
	if (bMenubar 	== null) { bMenubar 	= 0; }
	if (bScrollbars	== null) { bScrollbars	= 0; }
	if (bResizable 	== null) { bResizable 	= 0; }
	*/

	var nPosLeft	= (screen.width 		- nWidth) 	/ 2; if (nPosLeft < 25)	{ nPosLeft 	= 0; }
	var nPosTop		= (screen.availHeight 	- nHeight) 	/ 2; if (nPosTop < 50) 	{ nPosTop	= 0; }

	var sOptions	= ",width=" 		+ nWidth
					+ ",height=" 		+ nHeight
					+ ",left="			+ nPosLeft
					+ ",top="			+ nPosTop
					+ ",status="		+ ((bStatus != null?bStatus:false)?1:0)
					+ ",toolbar="		+ ((bToolbar != null?bToolbar:false)?1:0)
					+ ",menubar="		+ ((bMenubar != null?bMenubar:false)?1:0)
					+ ",scrollbars="	+ ((bScrollbars != null?bScrollbars:false)?1:0)
					+ ",resizable="		+ ((bResizable != null?bResizable:false)?1:0);

	if (oPopupWindow != null && !oPopupWindow.closed) { oPopupWindow.close(); };
	oPopupWindow = window.open(sUrl, 'MyInvites', sOptions);
}