AdPoll: results don't show image bars

I'm playing around with AdPoll and have hit a problem I can't find in these forums - it's all working fine except that the results don't show the coloured bars next to the percentages. There's a gap for them, which appears to be filled with "blank.gif". I'm using a narrow table width - is there a minimum width for coloured bars to show up?

See the problem at www.disley.org

Sudden inspiration hit, and now the problem is solved - in case anyone else has this apparent problem, AdPoll does not automatically allocate coloured bars to survey options - you have to do this yourself when you set up the survey (or you can go back and do it yourself later in the control panel as I did).

And the bars show up fine despite a maximum length of only 20 pixels.