ASP: cant convince my .asp to look in /thumbs

Righty ho, here we go again. This here code works and will display the appropriate image as long as it’s in the same folder as this asp file.

Response.Write("<p><img src=" + BookQuery(“BookImage”) + "></p>
");

But of course, my images are in a folder called thumbs.

Response.Write("<p><img src="/thumbs/ + BookQuery(“BookImage”) + "></p>
");

And this doesn’t seem to work. Apparantly, ‘thumbs’ is undefined. What can I do geniuses? Cheers.