[jQuery] jquery.flash error

[skunkwerk]

I'm getting the error:
block.call is not a function in line 95 of jquery.flash.js, as
reported by firebug

here's my javascript code:

$('#portal').flash(
{
          src: '"http://www.akbar.net/media/portal.swf',
          base: "http://akbar.net/path/file/";,
          width: 600,
          height: 450,
          flashvars: { file: 'wudif', username: 'imran' }
        },
        { version: 8 },
        { expressInstall: true }
);

html:
<div id="portal">You need to install flash</div>

suggestions/ideas?
thanks