On our home page http://www.data.org.uk there are three images under the heading "NEW! for members". When a user clicks on an image the should be prompted with an alert box asking if they wish to join or not, then, depending on what they click - "join" or "Not Now" - they should either be presented with a sample pdf - if 'not now' clicked - or the joining screen - 'join' clicked - where they obviously join and get the full version.
The site is made using joomla
Any pointers as to what i should do / look for, would be a huge help.
Please get in touch if you require more info / anything else.