I'm deveping online shop for saling clothes on Drupal Commerce.

I create product type (admin/commerce/product/types) with field "Size" (size of clothig)- type "select (text)".

In node page it looks :

But i need 5 buttons like:

I was trying customise it using jQuery, but my solution does not work correctly:
http://pastebin.com/fek6tHBe