function OpenWindow( uri, target, width, height )
{
	var winName = target
	var realWidth = width ? width : 500
	var realHeight = height ? height : screen.height - 400

	var left = Math.round( (screen.width-realWidth)/2 )
	var top =  Math.round( (screen.height-realHeight)/2 ) - 35

	var winOptions = 'status=yes,menubar=no,toolbar=no'
	winOptions += ',resizable=yes,scrollbars=yes,location=no'
	winOptions += ',width='  + realWidth
	winOptions += ',height=' + realHeight
	winOptions += ',left='   + left
	winOptions += ',top='    + top

	var win = window.open( uri, winName, winOptions )
	win.focus()

	return win
}