You will need to add:

float: left;

to whatever element is holding your thumbs. Now we are going from Smarty to just HTML/CSS. You will need to be careful with float because it can cause weirdness with other elements. You may also need to check the size of the containing element. It's a good idea to turn on borders for the element you are messing with, as it makes changes easier to see. Then just turn them off when you are done.

Hope it helps.