inline html images also as attachment

I am embedding images inline into an html message, which works great. However, the way I am displaying the images makes them too small to see clearly in their HTML form.

I am wondering if there is a way to somehow link to the full-size image within the html? I tried adding the image as both an inline and attachment, which displays the image twice (at least in Thunderbird with "Display attachments inline" selected). This is not the desired effect, ideally I would like the image to be linked to the attached image file so that when a user clicks the image in the HTML message, it opens the attached file for that image just like any normal attached file.

Is this possible, or is this dependent on the way the e-mail client handles the images? I should also note that these images are not publicly internet accessible, they come from a database, so they cannot be linked to externally.

Any help would be great.

I'm going to answer myself...

It was as easy as linking to the same url that I use in the img html tag. This provides the functionality I was looking for.