I want to be able to create a little voting system on my radio website so that people can choose a 'tune of the week' or similar.
I want them to be able to vote, and then a bar chart will automatically work out the new votes and display them in a bar chart (I want the bar chart to be permanent so that it can be seen at all times by visitors to the website, not just when someone votes and then for it to pop-up to show the results).
Does anyone know how it can be done, or even if there are any free versions available from somewhere on the internet?
Yes, it can be done. I've done it using ASP.NET to generate the graphic.
Use a database to store the survey data and generate the graphic on the fly. Use an IMAGE tag and set the URL to the page that generates the graphic, adding parameters on the end if the graphic generating page needs to be flexible (Example: /barchart.aspx?wide=100&high=50&survey_id=12).
I know it's also possible using PHP, though I have no PHP experience.