Gravity Forms – adding images that react to menu choices

Hey all!

I work for a small bicycle company and am trying to design a menu in gravity forms to provide pricing for our range. What I’d like to do is get the menu to display an image of the corresponding bike build when the build kit is selected in the drop down menu. Can I do this with the HTML box provided in the “standard fields” menu? How would I write the code for this to work?
Here is a link to the form on a test page so you can see what Im talking about. Thanks for any help!