matrix – import a large table from a website (html)

I am looking to import the big matrices on this web page to put the data into a standard Mathematica matrix but calls such as

Import["http://vfacstaff.ltu.edu/lshamir/temp/output.html"]

do not preserve separations, columns, etc. I suspect that an option is needed and delimiters to limit the range of import, but I do not know it well.

How to import such data in a matrix format so useful in Mathematica?