function popupWindow( sUri, iWidth, iHeight )
{
		var sWindowName = 'win' + Math.floor( Math.random()*1000 )
		var iRealWidth = iWidth ? iWidth : 600
		var iRealHeight = iHeight ? iHeight : screen.height - 300
	
		var iLeft = Math.round( (screen.width-iRealWidth)/2 )
		var iTop =  Math.round( (screen.height-iRealHeight)/2 ) - 35
	
		var sWindowOptions = 'status=no,menubar=no,toolbar=no'
		sWindowOptions += ',resizable=yes,scrollbars=yes,location=no'
		sWindowOptions += ',width='  + iRealWidth
		sWindowOptions += ',height=' + iRealHeight
		sWindowOptions += ',left='   + iLeft
		sWindowOptions += ',top='    + iTop
	
		var win = window.open( sUri, sWindowName, sWindowOptions )
		win.focus()
		
		return win
}