Images mess up my table layout

Here is the test file: http://www.nicoeinsidler.bplaced.net/test/mail_test.html

If there are no pictures everything works fine as expected, but as soon as I add picture to it they break my layout.

<img src="https://img.skitch.com/20110930-e89yb812kuhisgsuhf896aepnx.png" alt="http://www.nicoeinsidler.bplaced.net/test/mail_tes开发者_运维百科t.html" />

(I never layout my homepages with tables, so I'm not good at it. I have to do it because this will become a HTML-Email…)

Here is how it should look like:

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The td inside the following tr needs to have a colspan of 3 (instead of 2)

(You should see the broken border in that row)