White space I cannot find and remove - help please

Sorry to ask so much for help. I can't find where the white space 
between the four blocks above the footer with the address comes from? 
It's way too much empty space and I want to remove it. The menu in the 
footer does not have it; the blocks don't have empty space below the 
content in anyone of them. I have looked for css defining "first bottom" 
"second bottom" etc. but can't see anything in the style sheet. I have 
also looked at the templates, page.tpl.php etc. but nowhere does it give 
me a clue.

How can I remove that empty white space (I know, tautology)

thanks,

Pia

<http://hsd.piasworld.com>

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