what's wrong with ado.stream

From: myhyli (myhyli_at_hotmail.com)
Date: 08/23/04 

Date: Mon, 23 Aug 2004 17:06:12 +0800

//////////////////////////////////////////////////////////////////////
  var oStream = new ActiveXObject("adodb.stream");
  oStream.type = 1;
  oStream.mode = 1;

  oStream.open("URL=http://www.blueidea.com/bbs/icon/panliu888.gif")

  alert(oStream.Size);
  oStream=null;
//////////////////////////////////////////////////////////////////////

it reported "c004800a" error at the line "oStream.open(......"

why? and how to fixed it?