Absolute Wordpress upload path? Idea's?

Hi All,

I'm adding a plugin to the TinyMCE editor within wordpress, the button appears as it should where I want it to, but I click upload, select the file, but it doesn't upload.
So here's what it says in the readme.txt,
// The URL that points to the upload folder on your site.
// Can be a relative or full URL (include the protocol and domain)
$imageURL = '/demos/http/uploads';

// Full upload system path. Make sure you have write permissions to this folder
$uploadPath = '/var/www/demos/http/uploads';

Anyone know what paths I need? I presumed it was wp-content/uploads, but that's not working.

Thanks!

Kind Regards
Jack.