There is no citation widget of Google Scholar available, which can be used on custom websites. I wrote a small php script that parses the Google Scholar website and filters out the citation table and diagram.
The script needs your Google Scholar ID, which can be found in the url:
http://scholar.google.de/citations?user=qcZEIOkAAAAJ&hl=enThe ID (qcZEIOkAAAAJ) and the language must be passed to the script like this:
citations.php?id=qcZEIOkAAAAJ&lang=enThe script can be downloaded here.