Generate HTML Table with thumbnails from jpg images

This function generates an html file that contains a table with
thumbnails (and respective links) of the images stored in a provided
directory.

ARGUMENTS:
- Dir: the directory name in which the images are stored
- HtmlName: the name of the html file to be generated
- TSize: The size (in pixels) of the thumbnails images to be generated (the largest of the two dimensions (width or height), depending on the image orientation
- imagesPerRow: The number of thumbnails per row in the html page.

Example:
>> createThumbnailTable('images', 'examples.html', 180, 5);

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Theodoros Giannakopoulos
Dep. of Informatics and Telecommunications
University of Athens
http://www.di.uoa.gr/~tyiannak