Add "Vertical" and "Horizontal" radio buttons for those options

[Mardeg]

Simply so people can choose between joining images vertically or horizontally. Already done for you at http://htmlpad.org/concatenator/ :)

[jakub-g]

+1 :)

@Mardeg However, in your horizontal implementation I get a lot of excessive whitespace after the last image. Regardless of how many images I concatenate.

[Mardeg]

@jakub-g Anyone can play with/fix that code at http://htmlpad.org/concatenator/edit including you :)