legsweeps, saran wraps and candybars are similar, but all different tricks.. as far as i know they all come from motocross.
candybar: you kick one leg over your bars and bring it back, keeping both hands on all the time. here is a picture:
http://www.pusherbmxmagazine.com/yahoo_site_admin/assets/images/dgcandy.13381108_std.jpg
saran wrap: you put one leg straight over the bar (like a candybar) then instead of bring it back from the bar you take your hand off and swing your leg out to the side back to your deck.. (you only have to take off one hand for this trick) here is a picture:
http://www.dirtclaw.co.za/Images/Trick list/Advanced/Saran Wrap.jpg
legsweep: you swing your leg all the way round the bars from either left to right or right to left. (you have to take off one hand then the other hand for this trick) and here is a video off matt ogle doing a legsweep to manual:
http://www.youtube.com/watch?v=ZIm_1t7AIsQ
hope that clears things up!