Add thumbs exeption in excerpts

Hello,

On my blog, http://www.mydaily-gadget.com/, i have a slider in the header of the page. This slider exports the excerpt of an article and adds an image, resized, to the right.

How can i add an exception, in this slider, so that my excerpt not to contain the post’s thumb?

P.S: I am using a plugin to add thumbs in excerpts.