Images should vary based on Input in Smartform

Hi, 

My requirement is to display images in Smartform. Its Simple and working fine.

Now, I would like to display images based on my Input. Images should vary based on Input.

For Example:

Sales Order No: 1 should display Image 1 and

Sales Order No: 2 should display Image 2.

What will be my logic and where should i insert the logic in smartform.

With Regards,

Sudhir.