In this section (yours probably looks different by now):
Code:
//variableslide[x]=["path to image", "OPTIONAL link for image", "OPTIONAL text description (supports HTML tags)"]
variableslide[0]=['ball.gif', '', '']
variableslide[1]=['spaceship.gif', 'http://www.space.com', 'Has aliens landed on earth? You decide.']
variableslide[2]=['cake.gif', '', '']
If there is no link, and/or no description for the slide, it still must have an empty value, as opposed to what you probably have done, which is removed even the empty single quotes (highlighted in the above). In other words, Do Not Remove These. They are placeholders and are required to avoid that 'undefined' you are seeing.
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