function popUpWindow(URLStr, width, height) {
	// Center the window.
	var screen_width=window.screen.width
	var screen_height=window.screen.height
	var left=Math.round((screen_width-width)/2)
	var top=Math.round((screen_height-height)/2)   

	popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menub ar=no,scrollbar=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}