One item, one price, three sizes - don't understand the variant option

[eskymo]

I'm selling t-shirts. Each t-shirt comes in Large, Medium and Small, but are all priced at the same value. I have read your variants help page and followed the instructions, but get three drop down menus...each with one of my options in it. I want one drop down, so people can use it to choose the size, like in this website:



http://www.beagirlblog.com/bea_girl_today/shop.html



Can you please tell me how to do this as your help page on the subject and the on-page instructions do not explain the process at all. if they did I wouldn't be posting this thread.



Thanks

E