align is not a valid attribute for the img element in XHTML 1.1. Which is what FlightCrew meant by it not being defined (it's not in the list of valid things).
Similarly width is not a valid attribute for td in XHTML 1.1
You can see what you can and cant do with various elements either by reading the spec (It's what I do - but I'm beyond warped - http://www.w3.org/TR/xhtml-modulariz...dule_defs.html
Or you can look at a site such w3schools and remember that XHTML 1.1 is 'Strict'
(for the img tag)
(for the td tag)
(Look at the DTD it'll says either STF or TF - if it doesn't have the S there, then you can't use it).