WP Attachment Page issue

Hi,

I have a blog which uses image galleries for many posts as shown here: http://www.techwench.com/hp-elitebook-8740w-review/

When clicked on the image in a gallery, it takes us to the image attachment page eg: http://www.techwench.com/hp-elitebook-8740w-review/hp-elitebook-8740w-review-1/

But, this doesnt seem to be working for me from SEO/Traffic point of view. Google is indexing and showing attachment pages higher than the original posts. Although i have a link to the original post from attachment pages, many visitors are just leaving the site instantly

Can any one suggest how to get around this? perhaps May be i can redirect the attachment pages to the original post page automatically?

Any suggestions highly appreciated

Thanks