I have been hack

A few day ago, My web page were hack with “Spam”
I contact my Hosting and they help me “cleaning” what the hack put in.

But now I see in the HTML code for a lot of my pages, that has a code I didn’t put in there and I don’t want it there, because it has a lot of links to our pages that are not mine.

How can I go to the HTML of that pages and erase it?

The code that appear, is after the </html> and is this code:
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[Code moderated. Please do not post hack code blocks in the forums. Please use the pastebin]